This Chicago Park District "Night Out" event is actually a two-for-one at the compact Bosley Park: Vendors will set up the community flea market from 9 a.m. to 1 p.m. and the free community block party takes place 2 p.m. to 4 p.m.

The park district will provide a limited number of hamburgers and hot dogs for the party, which will include sack races, mother-son and daddy-daughter competitions, music and more.