See the website, Friggatriskaidekaphobia.com:
The Freethought Society’s (FS) next Anti-Superstition Bash will be held on Friday, May 13, 2011 from 7:00 PM to 11:00 PM in the beautiful Corinthian Yacht Club. The Club is located at 300 West 2nd Street, Essington, PA 19029. FS will host a “Friggatriskaidekaphobia Treatment Center,” which will be equipped to assist party attendees in getting over all their superstitions and start the process of ending magical thinking. The general admission (includes light fare) is $10 with $5 discounts available for students and seniors. Cash bar only. No BYOB. There is no charge for children under the age of 13.
Connect with other Philadelphia Atheists on this page: http://www.meetup.com/atheists-215/events/16570661/
PZ Myers will be in attendance. See his announement, "Friggatriskaidekaphobia time" on Pharyngula
Tom Flynn, Executive Director for the Council for Secular Humanism. See announcement on Center for Inquiry website.
David Silverman, President of American Atheists