Nebula has decorated the room with a few galaxy style details -the colour scheme is very black, purple and blue. But Nebula does know her galaxy theme.
There are sugar cookies with icing and edible stars on them, macaroons that Nebula bought which also stay with the theme. There's also piggies in blankets, tiny little hamburgers, pizza cut up small and a whole table of soft drinks. There will be a lot of 80's music with some 90's vibes, but don't hold that against Quill and Marty, it's all they know.
There is no alcohol at this party in respect of Carol's sobriety and if you bring some you are requested to drink it in the kitchen away from Carol and the kids who come.
Nebula has made a chocolate galaxy cake, and Quill is tasked with making goody bags towards the end so everyone gets a piece of cake home. If he fails, Nebula assures everyone they can punch him, it's how he learns.