Children in preschool through eighth grade may enjoy rides, carnival games, obstacle courses, a petting zoo, arts and crafts, police and fire vehicle displays, and disc dog performances. Noon to 4 p.m. Saturday. Pioneer Park, 526 E. Main St., Mesa. $7 per child, includes unlimited access to attractions. Free for adults. (480) 644-2352 or mesaaz.gov/parksrec.