Regarding the party, if you're really lucky it might have peed it down so much by then that the ground is waterlogged, and further luck would mean you get a monsoon on the actual night as well.
If they can guarantee it's a one off though it might be best to let it go in the interests of long term harmony unfortunately.
If they can guarantee it's a one off though it might be best to let it go in the interests of long term harmony unfortunately.