What a cool idea! This company is renting real movie theaters across the country and running double-features of old b-movies every Thursday night, for $5 admission. I missed the first two weeks, but this Thursday I'll seriously consider going to THE BRAIN THE WOULDN'T DIE/FIRST SPACESHIP ON VENUS!
It looks like they only have about 20 participating theaters, so it's probably not in your town, but you can check the participating locations
here.