Kaitlin's humans Bill came to the party in this (vaguely NSFW because of Gigi Hadid...who he did not come with, but yeeeeahhhh)
Leo came with Ava. Idefk what he was wearing, but I assume someone helped him pick something out.
Luna came in this. For your info, the star-shaped fairy lights were all over her dress and glowed a sort of bronze color. She charmed them that way. Her fairy light crown is glowing a blue color.
Annabeth came with Percy. She came in this dress but would have had sandals that weren't red. Maybe silver or brown. Idk. And her hair was curly.
Quentin Coldwater came in by himself wearing this with a jacket, too. He'd eventually have taken it off, though. Also his hair is not that short, it's just past his shoulders, But he probably pulled it back in a lil manbun.