Re: entrance. PENNY is going to meet up with Alice after she texted him. He'll definitely enjoy some food and at least the PG-13 side, and would leave early if Alice decides she's noping out.
CREDENCE decided that when in space you do as the space people do, so he picked up a little something in Naboo that he decided to try out tonight. He's a little self-conscious about it when he first arrives, but he'll get more easy going.
BUFFY bought a pretty dress in Naboo, so yes, she's going to be there.
ANAKIN is going to be there with Nico I think. He is less likely to dress up. He's wearing stuff he picked up at Naboo to take home with him, but it's not super formal, more along the lines of stuff his Dad might wear.
REN is coming with Eliot at least, I believe (?) and if he does, he'll be wearing something that Eliot picked out for him from Naboo. It'll be something along the style he'd normally prefer, but will be in a pastel color of whatever Eliot chose - yellow I think? It's colors. He's not certain about it, but he looks great in it because Eliot has great taste lbr.