I say do it for all holidays, but on the US servers (if it's possible, idk how the servers work) add Thanksgiving, Veteran's Day, 4th of July, etc. and do the same for other countries' holidays. For the Holidays (Christmas, Hanukah, etc.) have a general festive theme (like Christmas lights) and maybe have a Christmas tree, menorah, and other stuff spread out around the Tower, but don't make them too big.