Is there any traditional/ethnic costume party or that kind of gathering that is being planned already or people might be interested to join for? It would be fun to showcase the diversity of the Wikimedia community?
To add some fun Wikimedian A can write/print the name of their costume (preferably English Wikipedia entry) about the costume they would come wearing, and find a buddy (B) who speaks a different language than theirs. B can then create an entry on Wikipedia/Wikidata or expand the entry if already existing, or even record how it is pronounced.
People can also gift their buddies small keepsakes.