Update MediaEval 2026 schedule and deadlines

Author: cmihaigabriel

_editions/2026.md

@@ -18,9 +18,11 @@ Signup for MediaEval 2026 is now open via the [MediaEval 2026 registration form]
 ##### MediaEval 2026 Schedule:
 * Registration for task participation opens: January 2026
 * Test data release: 1 March 2026
-* Runs due: 1 May 2026
-* Working notes papers due: 31 May 2026
+* Runs due: 15 May 2026 - 1 June (check individual pages)
+* Working notes papers due: 10 June 2026
 * MediaEval 2026 Workshop, Mon.-Tue. 15-16 June 2026, Amsterdam, Netherlands and Online, co-located with ACM ICMR 2026
+* Camera ready deadline: 30 June 2026
+
 
 ##### The MediaEval Coordination Committee (2026): 
 * Mihai Gabriel Constantin, National University of Science and Technology Politehnica Bucharest, Romania