I'm all for the little adventures the night of a party. You know, go to place X and get the directions or whatever, or you only know what specific place it'll be at that afternoon. Kinda fun, you know? But knowing at least the GENERAL area (i.e. San Marcos vs. just "San Diego") or something like that is kewl. And don't pull a UFF, with their shit with Angelik, and change venues 4 times in 48 hours, 2 of them in the last like, 8. Just make sure your shit is together way beforehand so there is no last minute shit to ruin the party.
My US$0.02