slipjig has an Idea: "Make it a "Birthday Girl Is Too Overwhelmed to Plan" theme: everybody must bring something they think will make a party a bitchin' party. Be it food or wine or activities or decorations or door prizes or whatever. Which mean it will be the Theme of All Themes."
...that has potential.
He adds: "Actually, you know what a Meta-party would mean? The one true and destined venue for 1000 Blank White Cards."
...yeah, we're so doing this. March 7-8. My house (with caravan to Pandemonium Books for the s00j/Cat concert). Metaparty.