It could involve going to a sports game and having crazy adventures along the way. Maybe they get lost or meet some interesting characters.
The story could have them going to a new club and having trouble getting in. Once inside, they have a blast but one of them loses something important. Or it could be that they end up helping someone in need during their night out.
Well, it might start with them deciding on a place to go, like a bar or a concert. Then, something unexpected happens, like running into an old friend or getting into a friendly competition. They could also have some deep conversations about life and relationships.