It's called the PASTAH (short for, as I understand it, PA State Atheist/Humanist) Conference and it's taking place at the Doubletree dahn-tahn.
For tickets/schedule and so on, go to the atheistpa website or their facebook page.
From the P-G:
Pittsburgh has the honor of hosting its first Atheist/Humanist conference, the 2014 PASTAH Conference to be held August 29 through August 31, in Downtown Pittsburgh at the DoubleTree! A lineup of fantastic speakers has been recruited, including Jerry Coyne, Annie Laurie Gaylor, Fred Edwords, Jamila Bey, Jerry DeWitt, John Loftus, Monette Richards, Lauri Lebo, as well as local musicians and comedians. The conference is an excellent opportunity for freethinkers to socialize, network, and commune.Lynn Cullen did a segment on it, about halfway through her show, with local godless heathen, Ann Norman:
I still can't believe they're gonna let the godless heathens have their own goddamned conference. Next thing you know atheists'll be demanding the same equal rights the Constitution guarantees to all the good faithful normal Americans.