diff --git a/meeting-notes/20250603-jupytergis-sync/index.md b/meeting-notes/20250603-jupytergis-sync/index.md
index 8e76d4b..1ba8140 100644
--- a/meeting-notes/20250603-jupytergis-sync/index.md
+++ b/meeting-notes/20250603-jupytergis-sync/index.md
@@ -34,8 +34,8 @@ Please add new agenda items under the `New agenda items` heading!
 
 Your name / GitHub ID / affiliation
 
-* Martin Renou / @martinRenou / QuantStack
-* Matt
+* Martin Renou / `@martinRenou` / QuantStack
+* Matt / `@mfisher87` / Schmidt DSE
 * Greg
 
 ## Agenda
diff --git a/meeting-notes/20250805-jupytergis-sync/index.md b/meeting-notes/20250805-jupytergis-sync/index.md
index 5149b40..3aad15c 100644
--- a/meeting-notes/20250805-jupytergis-sync/index.md
+++ b/meeting-notes/20250805-jupytergis-sync/index.md
@@ -34,8 +34,8 @@ Please add new agenda items under the `New agenda items` heading!
 
 Your name / GitHub ID / affiliation
 
-* Arjun Verma / @arjxn-py / QuantStack
-* Matt Fisher / @mfisher / DSE
+* Arjun Verma / `@arjxn-py` / QuantStack
+* Matt Fisher / `@mfisher` / DSE
 
 
 ## Agenda
diff --git a/meeting-notes/20250819-jupytergis-sync/index.md b/meeting-notes/20250819-jupytergis-sync/index.md
index 05a4adb..9c148ec 100644
--- a/meeting-notes/20250819-jupytergis-sync/index.md
+++ b/meeting-notes/20250819-jupytergis-sync/index.md
@@ -34,8 +34,8 @@ Please add new agenda items under the `New agenda items` heading!
 
 Your name / GitHub ID / affiliation
 
-* Arjun Verma / @arjxn-py / QuantStack
-* Matt Fisher / @mfisher87 / DSE
+* Arjun Verma / `@arjxn-py` / QuantStack
+* Matt Fisher / `@mfisher87` / DSE
 
 
 ## Agenda
diff --git a/meeting-notes/20250820-virtual-hackathon/index.md b/meeting-notes/20250820-virtual-hackathon/index.md
new file mode 100644
index 0000000..84b738c
--- /dev/null
+++ b/meeting-notes/20250820-virtual-hackathon/index.md
@@ -0,0 +1,66 @@
+---
+title: "GeoJupyter virtual hackathon"
+description: |
+  A GeoJupyter virtual hackathon. Open to all!
+date: "2025-08-20"
+image: "../images/hackathon.jpg"
+author:
+  - name: "The GeoJupyter community"
+categories:
+  - "Hackathons"
+tags: [hackathons]
+---
+
+# GeoJupyter virtual hackathon (2025-08-20)
+
+Please add new agenda items under the `New agenda items` heading!
+
+- [Join us on Zoom](https://berkeley.zoom.us/j/92451699568)
+  - [What time is the meeting in my time zone?](https://dateful.com/convert/utc?t=2pm)
+- [Notes from previous hackathons](https://geojupyter.org/blog/#category=Hackathons)
+- [GeoJupyter](https://geojupyter.org) handy links:
+  - [GitHub org](https://github.com/geojupyter)
+  - [Community calendar](https://geojupyter.org/calendar.html)
+  - [Zulip chat](https://jupyter.zulipchat.com/#narrow/channel/471314-geojupyter)
+
+
+## Sign in!
+
+Your name / GitHub ID / affiliation / icebreaker
+
+* Matt Fisher / `@mfisher87` / DSE
+* Gus Becker / `@gusbusdraws` / CU Boulder
+
+
+## Agenda & notes
+
+### ⚡ (5 minutes) Lightning intros
+
+Tell us about you in 30 seconds or less!
+
+
+### 🌐 (5 minutes) Lightning demo
+
+What's new? Show & tell.
+Post on Zulip to request a show & tell slot;
+by default, QuantStack will demo awesome JupyterGIS progress each meeting!
+
+
+### 💡 (5 minutes) What will we hack on?
+
+* **What do you want to work on today**?
+  * For ideas, check out the [hackathon](https://github.com/geojupyter/jupytergis/labels/hackathon)
+    and [good first issue](https://github.com/geojupyter/jupytergis/labels/good%20first%20issue)
+    labels on the JupyterGIS project!
+* **Add your ideas to the “ideas” list below**.
+* **Add your favorite emoji or a `+` next to ideas you’re excited about**.
+  * Press the colon (:) key on your keyboard or navigate to “Insert > Emoji” in the menu bar to open the emoji browser.
+
+
+#### Ideas
+
+* New user story (Gus will open issue)
+    - Open fresh document
+    - Snapshots along the way producing static images in cells (`doc.snapshot()`?)
+    - Using `doc.sidecar()` for exploration
+    - Save final document as artifact (`doc.save()`?)
diff --git a/meeting-notes/20250909-core/index.md b/meeting-notes/20250909-core/index.md
index 99765e4..b4fa4e6 100644
--- a/meeting-notes/20250909-core/index.md
+++ b/meeting-notes/20250909-core/index.md
@@ -28,10 +28,10 @@ Please add new agenda items under the `New agenda items` heading!
 
 Your name / GitHub ID / affiliation
 
-* Shane Grigsby / espg / Astera Institute
-* Martin Renou / martinRenou / QuantStack
-* Nicolas Brichet / @brichet / QuantStack
-* Matt Fisher / @mfisher87 / affiliation
+* Shane Grigsby / `@espg` / Astera Institute
+* Martin Renou / `@martinRenou` / QuantStack
+* Nicolas Brichet / `@brichet` / QuantStack
+* Matt Fisher / `@mfisher87` / affiliation
 
 
 ### Standing items