I can't speak for whether or not the 'Crash the Tea Party' thing referenced here is real, or just some dweeb on the West Coast who's trying to sell t-shirts to liberal racists who don't want to admit that they're racists. Honestly, I could see either; one of the gratifying things about the Tea Party movement has been to see demonstrated that the Left's vaunted prowess at organization and activism largely depends on having no standard for comparison. They're really pretty lousy at this.
That being said, the advice found here is pretty good:
Plants have already happened, just not organized ones. Regardless, perhaps organizers (or attendees) need to have a few signs that say "Liberal Plant, not a REAL TeaPartier" and be on the lookout for these double-secret spies. When one is found, then pull out your signs and stand next to the plant. No violence or physical actions, just isolate and embarrass.
And make sure that you get it on the record that you've done this. I will keep harping on this until the end of time: a camera is an indispensable tool for these things. Without cameras they would have been able to get away with lying about Congressmen being spit on and called racial epithets*. So get one.
*Yeah, go ahead and burn that account. Over a failed narrative, no less.
Crossposted to Moe Lane.