KC & THE SUNSHINE BAND and GLORIA GAYNOR provided the soundtrack of the '70s, when dancing was done face-to-face and hand-in-hand. With a cut on the soundtrack for Saturday Night Fever, the hot and funky R&B vibe of the multiracial KC & the Sunshine Band was second only to the smooth harmony of the Bee Gees as the disco kings. Dust off your boogie shoes MAY 20, get ready to shake your booty, and make sure you stand for the women's national anthem, "I Will Survive." $33.50-$48.50. 7:30 p.m. Chastain Park Amphitheatre, 4469 Stella Drive. www.atlantaconcerts.com/chastain.html.