More changes related to Dec 1st

- update one more place where I mention the date
- use CET as the timezone b/c that's what FOSDEM uses

Author: atodorov

index.html

@@ -88,7 +88,7 @@ <h1>
 <a name="when" class="anchor" href="#when"><span class="octicon octicon-link"></span></a>When</h1>
 
 <ul>
-<li>CFP Submission Deadline: <strong>23:59 UTC, 01 December 2024</strong></li>
+<li>CFP Submission Deadline: <strong>23:59 CET, 01 December 2024</strong></li>
 <li>Schedule Announced: <strong>15 December 2024</strong></li>
 <li>Presentations: <strong>1st February 2025</strong></li>
 </ul>
@@ -105,7 +105,7 @@ <h1>
 
 <p>
     Please submit one (or more) 20-30 minute talk proposal(s) OR one (or more)
-    10 minute lightning talk proposal(s) by <strong>23:59 UTC on December 10th
+    10 minute lightning talk proposal(s) by <strong>23:59 CET on December 1st
     2024</strong>. We will notify all those submitting proposals about
     their acceptance by December 15th 2024.
 </p>