Ben had closed up quickly after the pub closed, eager to get to the party Dom had told him about. He wasn't at all worried that it was after one in the morning. A real party didn't even get started until about now.
He Apparated to the address he'd been given, and grinned when he noticed that the door was still open. He let himself in, and was pleased to see that there was still a good number of people hanging around, all in various states of drunkeness. It was loud, and there was some seriously awesome music playing, and Ben was feeling more like himself for the first time all week.
He looked around and recognized James Potter, and headed over. He might as well greet his host before getting a drink.