Nuts and Bolts comedy improvisation troupe from Rochester will perform at 7 p.m. July 21 at the Cellar Pub, Coxe Hall, 337 Pulteney Street. Admission is $8. The group encourages audience participation, taking suggestions to determine the theme and subject matter of the individual sketches. Everything is 100 percent improvised. The result is sometimes humorous, sometimes chaotic, but always entertaining. This event is part of the Geneva Summer Arts Festival.