The Palace Theatre, a restored art deco-style 1940s theater in Dallas-Fort Worth runs classic/vintage movies. This Saturday at 4 PM, they're running It's a Mad, Mad, Mad, Mad World on what I'm told is a big screen. That's one of my two requirements for enjoying this film at its maximum strength. The other is a large, enthusiastic audience.
The Palace is currently operating at 75% capacity so people don't have to sit so close to strangers. Their website also says "While masks are no longer a requirement, they are highly recommended. Staff will continue to wear masks." Even fully-vaccinated, I don't think I'd take the risk but you do what you want to do. And either way, let's thank Dan Koller for letting me know about it.