The Callithump returns with more thump than ever. Get your tickets now. And what is the Callithump? A Callithump!!! is: A noisy, boisterous parade; a riotous parade, accompanied by the blowing of tin horns and other discordant noises; a burlesque serenade; a charivari Callithump is a fundraiser and benefit for GRSF, and an extraordinary evening of entertainment from the company you love.