Museums of the Arroyo Day {MOTA} is Sunday May 20, 2018 12pm-5pm (last entrance at 4pm) 
There are 6 participating museums in Pasadena and Los Angeles that offer FREE entrance- The Gamble House, Los Angeles Police Museum, Lummis Home and Garden, Pasadena Museum of History, The Autry’s Historic Southwest Museum Mt Washington Campus, and Heritage Square Museum (pictured above) there will be free shuttles connecting all of them! Go out and have an adventure!
Visit their website for more details http://www.museumsofthearroyo.com/