Music on Main" event each Thursday evening. It's free (donations encouraged at the gate), with impressive nationally-recognized bands (like "March 4th"), food & beverage for sale by local vendors, and the biggest social scene in Teton Valley. Nothing beats warm summer evenings listening to good live music, in the shadow of the Tetons, with good friends.
Tin Cup Challenge. It's a good thing someone took a photo, because it might not ever happen again.