From the Wizard101 website: https://www.wizard101.com/game/news

Storm Deckathalon Event!

"Get ready for an event most shocking! Now through Monday, September 20th, battle your way through the Storm Deckathalon tower to test your TC-slinging skills, rise up the leaderboard ranks, and win exclusive prizes like the Storm Class Pet!"

See the Announcement here: https://www.wizard101.com/game/storm-deckathalon-event

See additional info here: Basic:Storm Deckathalon