There are typically two events held by Jack Lake Silent Sports Association:

• Crazy Eights WEMS Mountain Bike Race- (10 hour - 6 hour - 3 hour) Currently on for 2021
• Jack Lake Ultra Eights Trail Run (64 mile - 10k - 5k distances). Rucking classification for each distance. Cancelled for 2021. ​

Check out their own pages on here for more information.

Antigo Swim Club, also, hosts the MK Triathlon and Splash & Dash in the summer.