Free family-friendly event - hosted by City of Riverside, no need to register - just show up and enjoy! It has multiple locations/vendors downtown Riverside
"The Riverside Artswalk is a monthly community event that celebrates the diversity of arts and culture in Riverside and the Inland Empire. Visit over 22 downtown locations, including museums, galleries and studios, presenting an eclectic mix of visual and performing arts. Either before or after, enjoy the many entertainment, dining and shopping experiences that downtown Riverside has to offer. "
Get more info on the city's website including a map.