Cameron Snodgrass asks, "What are some ideas for a drive-in theater promotion?"
We have a non-profit planning an event just after the drive-in closes for the season. A few bands, some displays by providers (this one has to do with mental health) and of course, beer. Drive-in gets concession revenue; non-profit gets a cut of that. Gets their message out. And it's the non-profit that's actually buying the ad schedule.
You might also think about things you could do (farmer's market, flea market, uhhhh) during the day when the drive-in revenues are ZERO otherwise. Maybe some of the larger participants pay to play.
The drive-in gets the promotion and goodwill, some added revenue, and you don't have to thread the needle thinking about what to do there during intermission.
