Celebrate World Music Day, taking place in more than 500 cities across the globe, at this annual festival. Local musicians displaying varying genres and skill levels converge downtown to serenade the crowds. The event culminates in a special jam session and beer garden starting at 4 p.m. in Skyline Park. Interested in showing off your musical chops? Anyone is welcome to preregister to perform—or simply show up and claim a space on the 16th Street Mall. Fri 8 a.m.-8 p.m.