Revise task organizers and update schedule for 2026

Updated task organizers and revised task schedule with new deadlines.

Author: cmihaigabriel

_editions/2026/tasks/multisumm.md

@@ -112,20 +112,17 @@ https://aclanthology.org/2020.acl-main.703/
 
 
 #### Task organizers
-Gareth J. F. Jones, Maynooth University, Ireland
 
+* Gareth J. F. Jones, Maynooth University, Ireland
+* Anastasia Potyagalova, DCU, Ireland
 
-Anastasia Potyagalova, DCU, Ireland
-##### Task 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
-
-MediaEval 2026 Workshop, Sat.-Sun. 15-16 June 2026, Amsterdam, Netherlands and Online, co-located with ACM ICMR 2026
+##### Task 2026 Schedule:
+* Registration for task participation opens: January 2026
+* Test data release: 1 March 2026
+* Runs due: 1 June 2026
+* 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