It's called Tanabata, or the 'star' festival. From what I understand it originates from a place called Japan on Earth, which is a familiar enough world to most around here.

[not him! what the hell is earth. yall earth people, at least the necromancers were also in the dark. mostly.] And yes, I don't see why not? Palamedes spent a great deal of time cutting out paper for the wishes. You write one down and hang it.

[and they were burned later but... viktor will ask megumi if he can just do that for whatever kaworu might want to write. hopefully it wouldn't be rude or cursed or something.] There was food, origami I believe it's called? Fireworks. Better this time. [because he's a show off.]