A Day at the Diamond celebrates spring training baseball, the return of the Oakland A's to Mesa and the grand reopening of Hohokam Stadium. This free event is Saturday, Feb. 21 from 11am to 5pm at Hohokam Stadium, 1235 N. Center St. There will be numerous fun activities for the entire family including a kid's zone, live music, a sports card show and tours of the stadium. For more, visit www.mesaaz.gov