For a 12/12/12 party guests could each bring three trays of finger foods (three because of the three 12s). Each tray would hold 12 items, such as 12 deviled eggs, 12 hot wings, 12 sliders, etc. And of course the drinks could be 12-ounce cans.
DC running wild.
(And not enough time to corrupt a couple admins & mods to remain behind...)
It WILL get ugly pretty fast without them.