Dean, Seamus, Susan and probably some NPCs
Seamus hadn't thought at all about what he would wear until about twenty minutes before he was due to leave. He realised just how big a mistake that was when he was standing in the middle of his bedroom, wearing boxers and an undershirt with clothes strewn across the floor. Everything he had that was 'nice' was too hot. The weather had been baking the last few days and even knowing Wingbeat had climate-control charms wasn't enough to convince Seamus to wear one of his longer-sleeved shirts. Eventually, sifting through his drawer, he found a t-shirt that had been a gift from Dennis or Dominic - he couldn't remember - a few years ago. It fit tight, but seemed appropriate and Seamus didn't waste any more time second guessing his decision. Instead, he performed too sticking charms - one to attach his undershirt to the inside of his jeans and another to attach the t-shirt to the undershirt. He knew from past experience that club patrons could be handsy, especially around Pride, and he wasn't going to run the risk of someone accidentally pushing his t-shirt up too high.
He'd been torn between the glittery drink and the rainbow one, but had eventually settled for one each of Genie's layered concoctions - too impressed by the work to decline. (He'd have to have one of Dominic's fairy wands next.) He'd downed the shot fast, and was now sipping his rainbow drink more slowly as he watched the celebrations. Or tried to. Dean's shirt was such a vibrant green against his dark skin that Seamus's eyes were drawn back to it over and over again. "I feel so underdressed," he complained. "No one said we were getting dressed up."
For all his complaints, he was grinning. Dean was in a club - and he wasn't miserable. Seamus hadn't minded that Dean couldn't come clubbing with him, but he knew Dean had and that was more than enough reason to be glad Charlie had made this evening possible. "People are going to think I'm your little brother crashing your date," he added with an exaggerated pout. It was true that with the height difference, the curls and the juvenline t-shirt Seamus didn't feel anywhere near as sophisticated as his friends looked. He was used to that with Susan - but Dean was usually as comfy in jeans and a t-shirt as Seamus was.