You can go free almost any day. Step one. Go to local library. Step two. Ask library for card. Step three. Ask for culture passes available. Step four. Check out pass for the dozens of museums they have. Step five. Take a friend, the pass is good for two people.
Culture pass is one way and I believe first Friday is also an option.
Check with Phoenix public library
Call them for info.
Thanks! Your answer is awaiting moderation.