Kids ages 6-17 traverse a mud-filled obstacle course, and younger tots get a separate mud play area, at Mighty Mud Mania, 8 a.m. to 1 p.m. Saturday. Chaparral Park, 5401 N. Hayden Road, Scottsdale. $1 or a donation of one nonperishable food item for Vista del Camino Food Bank. Shoes, shirts and signed permission slips required. (480) 312-2771 or www.scottsdaleaz.gov/MightyMudMania.