Popcorn bar?

I think that it is a unique and fun idea! I would also offer something else (like veggies and fruit) for guests who don't eat popcorn or want something else to munch on while the social hour goes on!

I'd offer one or two more filling appetizers too, and some tea or flavored water as well.

I'd also think about how the popcorn bar fits with whatever meal you are planning after this time period. If you're having a formal sit-down dinner, then I probably wouldn't want to eat much popcorn before that. If the meal is more like casual picnic food, then maybe I'd eat popcorn. If you're have a heavy, potentially salty meal, like Mexican food or BBQ, I am not going to want salty popcorn before that. At a movie, I love popcorn, and probably eat too much in a sitting, but I think it's kind of an usual appetizer that may or may not fit well with whatever follows it. I've seen people on this forum talk about a late-night snack popcorn bar, and that makes more sense to me after people having been drinking. It's a personal choice, but it wouldn't necessarily be my choice.

I love the idea, it seems fun but I would also suggest you should maybe include some mocktails and appetizers