The Skepchicks are sponsoring a pertussis vaccination clinic at Dragon*Con over Labor Day weekend. They're teaming up with the Georgia Dept. of Health, who is providing free assistance and vaccines, but they need some assistance raising funds to cover space rental, posters, and other miscellaneous charges. If you're able to assist, you can donate to their "Hug me! I'm vaccinated!" campaign at the links included in the post.
And while I'm nagging about donations, I'll also note that donations to help the flooded in Pakistan have been slow, especially compared to the Haiti earthquake. If you can spare a few dollars, Doctors Without Borders is one of my favorite charities (though I've not seen a dedicated Pakistan donation page there), and here is one list of other charities working there. With either of these causes, remember that every little bit helps.