“Dreamgirls” may just knock your socks off! With shows at the Averitt Center tonight and Saturday at 7:30 and a matinee at 2 p.m. Sunday, Dreamgirls is based on the show business aspirations and successes of R&B acts such as The Supremes, James Brown, The Shirelles, Jackie Wilson and others. Dreamgirls follows the story of a young female singing trio from Chicago who become music superstars.