A sit in
When a bunch of people crowd around somewhere and won’t leave until they get what they want. It’s like a group of people blocking the way just to be a pain in the ass.
The protesters did a sit in at the school. No one could get in.
My friends did a sit in at the mall. They wouldn’t leave until they got free food.
My brother and his friends did a sit in in the park. They blocked the whole path.