Add task schedule to enthymeme.md

Added task schedule with important dates for participation.

Author: cmihaigabriel

_editions/2026/tasks/enthymeme.md

@@ -119,6 +119,14 @@ The data will be released in three parts:
 
 *Data will be made available as of the 1st of March.*
 
+##### Task 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
 
 #### References