Family-friendly outdoor festival featuring performances by area rock bands, including the popular veteran Ypsi Detroit-style rock ’n’ roll band Mazinga, the Ypsi “garage-a-billy” power trio Las Drogas, the local indie psychedelic-rock band King Norman, the local instrumental rock ’n’ roll & surf quartet the Vicissitones, and the Stomp Rockets, an energetic local garage-punk quintet that’s the latest in a long, storied line of great bands fronted by the charismatic vocalist Dan Mulholland. BYOB and a chair. 2–7 p.m., Olson Park Pavilion, 1515 Dhu Varren. Free; band tips encouraged. bit.ly/honkfestv.