Fix time for community organizers open space (#1467)

Author: cmaureir

src/content/pages/community-activities.mdx

@@ -25,7 +25,7 @@ importantly, it's a chance to explore how the EuroPython Society can support you
 goals and addressing your current challenges.
 
 * Room: 223+224
-* Time: Friday 18th, 12:00h - 13:00h
+* Time: Friday 18th, 11:00h - 13:00h
 
 ![](./images/pyo-open-space.jpg)