“Chicago quartet Third Coast Percussion continue to celebrate their 20th year with this kaleidoscopic all-day event at Epiphany Center for the Arts. Rhythm Fest consists of 17 sets in four spaces (plus three open jams and an audiovisual installation by drummer Glenn Kotche), and the lineup is thick with TCP’s current and former collaborators. The program includes plenty of music that isn’t percussion based: Composer, vocalist, and bassist Ayanna Woods is bringing two singers and a keyboardist, for instance; violinist Jessie Montgomery and cellist Tahirah Whittington have assembled an ensemble of string players and poets; and ~Nois are a saxophone quartet. But this isn’t called “Percussion Fest.” It’s Rhythm Fest, and you can’t have music without rhythm.”