Digable Planets: One of the most influential hip-hop trios to emerge in the late ’80s/early ’90s, “Butterfly” (Ishmael Butler), “Ladybug Mecca” (Mariana Vieira) and “Doodlebug” (Craig Irving) will be playing their 1993 boundary-pushing debut “Reachin’ (A New Refutation of of Time and Space)” in full — which features their biggest hit “Rebirth of Slick (Cool like that).” The album helped usher in a new era of Afro-futuristic hip-hop, layering elements of jazz and electronics. While Butler is no stranger to Riot Fest, playing last year as one-half of duo Shabazz Palaces, it’ll be interesting to see him come out from behind the turntables and play off his bandmates on stage. (5:15 p.m., Radicals Stage)