Tremont Arts Festival -- always a lot of fun! Great art by local artists (one of my favorite local ceramists, Gina DeSantis will have her work there) live entertainment, activities for children provided by local non-profits, the APL moble adoption van filled with cats and dogs and delicious food from local churches and restaurants.
Hours: Saturday 11-6, Sunday 12-5
See the Tremont website [1] for details.
Links:
[1] http://www.tremonter.com/