Add tutorial and sprint days

Author: jasongrout

_layouts/default.html

@@ -122,7 +122,7 @@
                 <div class="con-container img-responsive">
                     <div class="col-lg-8 con-content md-offset-2">
                         <a href="https://events.linuxfoundation.org/jupytercon/"><img class="con-title img-responsive" src="assets/JupyterCon-Logo-white.svg" alt="The JupyterCon Logo" /></a>
-                        <div class="con-date">November 04-05, 2025</div>
+                        <div class="con-date">November 4-5, 2025; Tutorials November 3, Sprints November 6</div>
                         <div class="con-program">
                             <p>San Diego, California</p>
                         </div>