10:00 am - 3:00 pm Arizona History Museum free open house August 23 @ 10:00 am - 3:00 pm MST Arizona History Museum free open house by Carolyn Classen, blogger Celebrate 250+ years of Tucson with us and enjoy FREE admission to the Arizona History Museum, Tucson on August 23, 2025! Open 10 a.m. to 3 p.m., part of the All Things Tucson 250+ Celebration.View Event →