Update (4/27/21): Here are the offseason PVP events: S.W.O.R.D. Fighting (4/25), Claws for Concern (4/27, Four Score (4/29), The Best Offense (5/2), and Danger Room (5/4).
At the conclusion of the Power Stone Season, there will be an extended offseason by 7 additional days. The next season will start on May 6.
Have a nice weekend everyone!