To Paraphrase Dorothy Boyd
...with portable video cameras, and document everything. It might also be a good idea, as a commenter suggests, to print out these flyers and pass on copies to local police and media, in advance.
Glenn makes a good point though.
If you are attending any of the local Tea Party rallies over the next couple of weeks, be on the lookout for anyone trying to pass themselves off as one of us, while carrying signs with racially inflammatory or threatening language.
Get them on tape, follow their every move. Watch for buses or vehicles with identifying markings or stickers. As I've learned first-hand on several occasions, you can often do a lot more good for the cause by carrying a video camera, rather than a flag or a sign.