According to TPM, the second annual Tea Party Convention has been canceled:

According to the Las Vegas hotel that was supposed to play host to the second national tea party convention, the much-hyped event has been canceled. Organizers of the convention haven't returned my calls, but grassroots tea party leaders I talked to today said that they haven't heard a word about the convention in awhile — and Nevada leaders told me that if the event is canceled, good riddance.

The article lists other high-profile Tea Party events that have fallen through recently. That's what I like in my political movements: An inability to organize.