diff --git a/intranet/apps/eighth/admin.py b/intranet/apps/eighth/admin.py
index 1143767833..c452353475 100644
--- a/intranet/apps/eighth/admin.py
+++ b/intranet/apps/eighth/admin.py
@@ -36,9 +36,9 @@ class EighthBlockAdmin(SimpleHistoryAdmin):
 
 @admin.register(EighthScheduledActivity)
 class EighthScheduledActivityAdmin(SimpleHistoryAdmin):
-    list_display = ("activity", "block", "comments", "admin_comments", "cancelled", "attendance_taken")
-    list_filter = ("attendance_taken", "cancelled", "block")
-    ordering = ("-block", "activity__name")
+    list_display = ("activity", "block", "hidden_until", "comments", "admin_comments", "cancelled", "attendance_taken")
+    list_filter = ("attendance_taken", "cancelled", "block", "hidden_until")
+    ordering = ("-block", "hidden_until", "activity__name")
     search_fields = ("activity__name",)
 
 
diff --git a/intranet/apps/eighth/exceptions.py b/intranet/apps/eighth/exceptions.py
index 7b44b5bc44..18a2b28dbb 100644
--- a/intranet/apps/eighth/exceptions.py
+++ b/intranet/apps/eighth/exceptions.py
@@ -32,6 +32,7 @@ class SignupException(Exception):
             "You may not sign up for this restricted activity. You are not on the authorized list.", "This activity is restricted for this student."
         ),
         "Blacklisted": m("You are blacklisted from this activity.", "This student is blacklisted from this activity."),
+        "ActivityHidden": m("This activity is currently hidden and cannot be signed up for.", "This activity is currently hidden."),
         "OverrideBlockLocked": m(
             "An override block ({0}) has been locked. Signup is not allowed at this time.", "An override block ({1}) has been locked."
         ),
diff --git a/intranet/apps/eighth/forms/admin/scheduling.py b/intranet/apps/eighth/forms/admin/scheduling.py
index 6da24c5941..76b2166e13 100644
--- a/intranet/apps/eighth/forms/admin/scheduling.py
+++ b/intranet/apps/eighth/forms/admin/scheduling.py
@@ -49,6 +49,7 @@ class Meta:
             "restricted",
             "sticky",
             "both_blocks",
+            "hidden_until",
             "comments",
             "admin_comments",
         ]
@@ -57,6 +58,7 @@ class Meta:
             "title": forms.TextInput(attrs={"size": 30}),
             "comments": forms.Textarea(attrs={"rows": 2, "cols": 30}),
             "admin_comments": forms.Textarea(attrs={"rows": 2, "cols": 30}),
+            "hidden_until": forms.DateTimeInput(attrs={"class": "datetimepicker"}),
         }
 
     def clean(self):
diff --git a/intranet/apps/eighth/migrations/0073_eighthscheduledactivity_hidden_until_and_more.py b/intranet/apps/eighth/migrations/0073_eighthscheduledactivity_hidden_until_and_more.py
new file mode 100644
index 0000000000..4c7ecf1f7c
--- /dev/null
+++ b/intranet/apps/eighth/migrations/0073_eighthscheduledactivity_hidden_until_and_more.py
@@ -0,0 +1,22 @@
+# Generated by Django 5.2.8 on 2025-12-23 15:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("eighth", "0072_alter_eighthscheduledactivity_waitlist"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="eighthscheduledactivity",
+            name="hidden_until",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="historicaleighthscheduledactivity",
+            name="hidden_until",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+    ]
diff --git a/intranet/apps/eighth/models.py b/intranet/apps/eighth/models.py
index dbec7b3a1e..aa35b46c66 100644
--- a/intranet/apps/eighth/models.py
+++ b/intranet/apps/eighth/models.py
@@ -385,6 +385,14 @@ def get_active_schedulings(self) -> QuerySet | Collection["EighthScheduledActivi
 
         return EighthScheduledActivity.objects.filter(activity=self, block__date__gte=date_start, block__date__lte=date_end)
 
+    @property
+    def is_hidden(self) -> bool:
+        """Returns whether the activity is hidden.
+        Returns:
+            Whether the activity is hidden.
+        """
+        return self.get_active_schedulings().filter(hidden_until__isnull=False, hidden_until__gt=timezone.now()).exists()
+
     @property
     def is_active(self) -> bool:
         """Returns whether an activity is "active."
@@ -891,7 +899,8 @@ def title_with_flags(self) -> str:
             The full title for the scheduled activity, with flags.
         """
         cancelled_str = " (Cancelled)" if self.cancelled else ""
-        name_with_flags = self.activity._name_with_flags(True, self.title) + cancelled_str  # pylint: disable=protected-access
+        hidden_str = " (Hidden)" if self.is_hidden else ""
+        name_with_flags = self.activity._name_with_flags(True, self.title) + cancelled_str + hidden_str  # pylint: disable=protected-access
         if self.special and not self.activity.special:
             name_with_flags = "Special: " + name_with_flags
         return name_with_flags
@@ -914,6 +923,14 @@ def is_activity_sticky(self) -> bool:
         """
         return self.sticky or self.activity.sticky
 
+    @property
+    def is_hidden(self) -> bool:
+        """Returns whether the scheduled activity is hidden.
+        Returns:
+            Whether this scheduled activity is hidden.
+        """
+        return self.hidden_until is not None and timezone.now() < self.hidden_until
+
     def get_true_sponsors(self) -> QuerySet | Collection[EighthSponsor]:  # pylint: disable=unsubscriptable-object
         """Retrieves the sponsors for the scheduled activity, taking into account activity defaults and
         overrides.
@@ -1222,6 +1239,10 @@ def add_user(
 
         exception = eighth_exceptions.SignupException()
 
+        if self.is_hidden:
+            if request is None or not request.user.is_eighth_admin:
+                exception.ActivityHidden = True
+
         if user.grade and user.grade.number > 12:
             exception.SignupForbidden = True
 
@@ -1637,6 +1658,8 @@ def __str__(self):
         suff = f" - {self.title}" if self.title else ""
         return f"{self.activity}{suff} on {self.block}{cancelled_str}"
 
+    hidden_until = models.DateTimeField(null=True, blank=True)
+
 
 class EighthSignupManager(Manager):
     """Model manager for EighthSignup."""
diff --git a/intranet/apps/eighth/serializers.py b/intranet/apps/eighth/serializers.py
index 6f187581b5..9772568420 100644
--- a/intranet/apps/eighth/serializers.py
+++ b/intranet/apps/eighth/serializers.py
@@ -6,6 +6,7 @@
 from django.contrib.auth import get_user_model
 from django.db import transaction
 from django.db.models import Count
+from django.utils import timezone
 from rest_framework import serializers
 from rest_framework.reverse import reverse
 
@@ -151,6 +152,8 @@ def process_scheduled_activity(
             "sponsors": [],
             "restricted": scheduled_activity.get_restricted(),
             "restricted_for_user": restricted_for_user,
+            "hidden": scheduled_activity.is_hidden,
+            "hidden_until": scheduled_activity.hidden_until,
             "both_blocks": scheduled_activity.is_both_blocks(),
             "one_a_day": activity.one_a_day,
             "special": scheduled_activity.get_special(),
@@ -231,6 +234,9 @@ def fetch_activity_list_with_metadata(self, block):
             .order_by("activity__administrative", "administrative", "activity__name")
         )
 
+        if user is None or not user.is_eighth_admin:
+            scheduled_activities = scheduled_activities.exclude(hidden_until__isnull=False, hidden_until__gt=timezone.now())
+
         for scheduled_activity in scheduled_activities:
             # Avoid re-fetching scheduled_activity.
             activity_info = self.get_activity(
diff --git a/intranet/apps/eighth/views/activities.py b/intranet/apps/eighth/views/activities.py
index 2732803c43..b472bfcb35 100644
--- a/intranet/apps/eighth/views/activities.py
+++ b/intranet/apps/eighth/views/activities.py
@@ -8,7 +8,7 @@
 from django.contrib import messages
 from django.contrib.auth import get_user_model
 from django.contrib.auth.decorators import login_required
-from django.db.models import Count
+from django.db.models import Count, Q
 from django.http import Http404, HttpResponse
 from django.shortcuts import get_object_or_404, render
 from django.utils import timezone
@@ -35,6 +35,9 @@ def activity_view(request, activity_id=None):
     activity = get_object_or_404(EighthActivity, id=activity_id)
     scheduled_activities = EighthScheduledActivity.objects.filter(activity=activity)
 
+    if request.user.is_student and activity.is_hidden:
+        scheduled_activities = scheduled_activities.filter(Q(hidden_until__isnull=True) | Q(hidden_until__lte=timezone.now()))
+
     show_all = "show_all" in request.GET
     if not show_all:
         first_date = timezone.localtime(timezone.now()).date()
diff --git a/intranet/apps/eighth/views/admin/scheduling.py b/intranet/apps/eighth/views/admin/scheduling.py
index 66fed30ff9..c146cc4031 100644
--- a/intranet/apps/eighth/views/admin/scheduling.py
+++ b/intranet/apps/eighth/views/admin/scheduling.py
@@ -85,6 +85,7 @@ def schedule_activity_view(request):
                         "both_blocks",
                         "comments",
                         "admin_comments",
+                        "hidden_until",
                     ]
                     if "rooms" in form.cleaned_data:
                         for o in form.cleaned_data["rooms"]:
@@ -234,6 +235,7 @@ def schedule_activity_view(request):
                         "scheduled": not sched_act.cancelled,
                         "cancelled": sched_act.cancelled,
                         "sticky_students": sched_act.sticky_students.all(),
+                        "hidden_until": sched_act.hidden_until,
                     }
                 )
             except KeyError:
diff --git a/intranet/templates/eighth/admin/schedule_activity.html b/intranet/templates/eighth/admin/schedule_activity.html
index ee1499ec55..a53bb0b652 100644
--- a/intranet/templates/eighth/admin/schedule_activity.html
+++ b/intranet/templates/eighth/admin/schedule_activity.html
@@ -10,6 +10,7 @@
     <script src="{% static 'js/vendor/underscore-min.js' %}"></script>
     <script src="{% static 'js/vendor/jquery.stickytableheaders.min.js' %}"></script>
     <script src="{% static 'js/vendor/jquery.are-you-sure.js' %}"></script>
+    <script src="{% static 'vendor/datetimepicker-2.4.5/jquery.datetimepicker.js' %}"></script>
     <script>
         window.all_sponsors = _.values($.parseJSON("{{ sponsors_json }}"));
         window.all_rooms_lookup = $.parseJSON("{{ rooms_json }}");
@@ -79,10 +80,18 @@
     </script>
 
     <script src="{% static 'js/eighth/schedule.js' %}"></script>
+    <script>
+        $(document).ready(function() {
+            $(".datetimepicker").datetimepicker({
+                format: 'Y-m-d H:i:s'
+            });
+        });
+    </script>
 {% endblock %}
 
 {% block css %}
     {{ block.super }}
+    <link rel="stylesheet" href="{% static 'vendor/datetimepicker-2.4.5/jquery.datetimepicker.css' %}">
     {% stylesheet 'eighth.schedule' %}
 {% endblock %}
 
@@ -230,6 +239,9 @@ <h4>Select an Activity:</h4>
                     <th class="both_blocks" colspan="2">
                         <span>A &amp; B</span>
                     </th>
+                    <th class="hidden-until" colspan="2">
+                        <span>Hidden Until</span>
+                    </th>
                     <th>Comments</th><th></th>
                     <th>Admin Comments</th><th></th>
                     <th>Sticky Students</th><th></th>
@@ -307,12 +319,16 @@ <h4>Select an Activity:</h4>
                                     </div>
                                 {% elif field.name == "scheduled" %}
                                     {% render_field field class='scheduled' %}
+                                {% elif field.name == "hidden_until" %}
+                                    <div style="text-align: center">
+                                        {% render_field field class='datetimepicker' autocomplete='off' %}
+                                    </div>
                                 {% else %}
                                     {{ field }}
                                 {% endif %}
                                 </td>
 
-                                {% if field.name in "rooms capacity sponsors title special administrative restricted sticky both_blocks comments admin_comments sticky_students " %}
+                                {% if field.name in "rooms capacity sponsors title special administrative restricted sticky both_blocks comments admin_comments sticky_students hidden_until" %}
                                 <td class="propagate" data-base-field="{{ field.name }}">
                                     <a class="propagate {{ field.name }} button" title="Propagate" data-block="{{ form.block.value }}" data-field="{{ field.name }}" data-input="{{ field.id_for_label }}">
                                         <i class="fas fa-arrows-alt-v"></i>
diff --git a/intranet/templates/eighth/signup.html b/intranet/templates/eighth/signup.html
index d07dbdd6ee..227abee34f 100644
--- a/intranet/templates/eighth/signup.html
+++ b/intranet/templates/eighth/signup.html
@@ -113,6 +113,8 @@
                 <span class="activity-icon fav <% if (favorited) { %>fav-sel<% } %>"></span>
                 <% if (cancelled) { %>
                     <span class="activity-icon cancelled"></span>
+                <% } else if (hidden) { %>
+                    <span class="activity-icon hidden"></span>
                 <% } else if (restricted_for_user) { %>
                     <span class="activity-icon restricted"></span>
                 <% } else if (waitlisted) { %>
@@ -145,6 +147,10 @@
                     <span class="badge darkred" title="This activity was cancelled.">CANCELLED</span>
                 <% } %>
 
+                <% if (hidden) { %>
+                    <span class="badge grey" title="This activity is hidden until <%= new Date(hidden_until).toLocaleString('en-US', { month: 'numeric', day: 'numeric', year: 'numeric', hour: 'numeric', minute: '2-digit', hour12: true }) %>">Hidden</span>
+                <% } %>
+
                 <% if (restricted_for_user) { %>
                     <span class="badge purple" title="You are not on the authorized list for this restricted activity.">Restricted</span>
                 <% } else if (restricted) { %>
@@ -197,6 +203,10 @@ <h3 class="activity-detail-header">
             <span class="badge darkred clickable cancelled-badge" data-append-search="is:c" title="This activity was cancelled.">CANCELLED</span>
         <% } %>
 
+        <% if (hidden) { %>
+            <span class="badge grey" title="This activity is hidden until <%= new Date(hidden_until).toLocaleString('en-US', { month: 'numeric', day: 'numeric', year: 'numeric', hour: 'numeric', minute: '2-digit', hour12: true }) %>">Hidden</span>
+        <% } %>
+
         <% if (special) { %>
             <span class="badge green clickable" data-append-search="is:sp" title="This is a special activity.">Special</span>
         <% } %>