I have put together a list of all the things I might want to bring. The list is overkill, most of the time I just cross some stuff off. But I always print a copy of the list and have it on the kitchen table in the morning when I'm getting ready. I check off each item (or cross it off). Every time I've discovered something I'd forgotten or would like to bring, I've added it to the list.
In retrospect, "Let's get the goat drunk"
should have been my cue to leave the party.