Changed calendar shared task

Author: helemanc

_pages/mm-argfallacy2025.md

@@ -145,9 +145,9 @@ Metrics will be computed on the hidden test set to determine the best system for
 # Key Dates (Anywhere on Earth)
 
 - **Release of Training Data**: February 25th
-- **Release of Test Set**: March 24th
-- **Evaluation Start**: April 14th
-- **Evaluation End**: April 25th
+- **Release of Test Set**: ~~March 24th~~ → April 1st
+- **Evaluation Start**: ~~April 14th~~ → April 21st
+- **Evaluation End**: ~~April 25th~~ → April 30th
 - **Paper Submission Due**: May 15th
 - **Workshop**: July 31st