Update MediaEval 2026 Workshop dates

Author: cmihaigabriel

_editions/2026.md

@@ -20,7 +20,7 @@ Signup for MediaEval 2026 opens in January.
 * Test data release: 1 March 2026
 * Runs due: 1 May 2026
 * Working notes papers due: 31 May 2026
-* MediaEval 2026 Workshop, Sat.-Sun. 15-16 June 2026, Amsterdam, Netherlands and Online, co-located with ACM ICMR 2026
+* MediaEval 2026 Workshop, Mon.-Tue. 15-16 June 2026, Amsterdam, Netherlands and Online, co-located with ACM ICMR 2026
 
 ##### The MediaEval Coordination Committee (2026): 
 * Mihai Gabriel Constantin, National University of Science and Technology Politehnica Bucharest, Romania