(SONIC INSTALLATION) Sixteen discrete channels of sound will be broadcast over 16 handmade loudspeakers arranged in Westlake Park. This sound installation takes place five times daily from March 23 to 26. Today at 4:30 p.m., the scrappy, brilliant Infernal Noise Brigade joins the melee. The idea, says organizer Robb Kunz, is an event that blurs the distinction between carnival and chaos. It'll be fun to see what the cops do. (Westlake Park, Fourth Ave and Pine St. 4:30 pm, free, all ages.)