10am-3pm Sat. Sep. 18 2021 Montana Youth Organizing Summit: A Weekend of Action This year, the Williams Effect weekend will begin on September 17th with a block party, concert, and ceremony in honor of our 25 Under 25 Awardees, and culminate in a Day of Action on Saturday, September 18th. Bogert Park S. Church Ave. , Bozeman Cost: FREE Age: Youth (15-30)