Last minute activity for my parents meeting partner’s polar opposite parents for the first time?

My partner and I’s families live in different states and have never met before. His family can be summed up as all-American, white, wealthy, pro-Trump conservatives. My family is middle class, sciencey, very eclectic immigrants. My partner himself is similar to my family and meshes well with them.

We are thinking of getting engaged soon, so our families wanted to meet at least once before then. Our original plan we had come up with is that my family would come down to Houston for two nights and do the following:

• First day: meet up at nice restaurant for dinner that serves my country’s food because his family has never really had exposure to our culture.
• Second day: go to a gun club his family is a part of because my parents are totally down to try shooting guns for the first time and his parents are all about that kind of stuff (my partner and his dad are ex military). We will grab some food later and then go back to his parents house to hang out, have some drinks, play some board games, etc in the evening (they love to host), and we will travel back home the following morning.

The problem is that the gun club we were SUPPOSED to go to will be closed. What should we do now? We were thinking maybe going to a museum or something but his parents aren’t “nerdy” and I hope we can do something everyone can enjoy. Any ideas?

EDIT: formatting