Join one of Philly's best St. Patrick's Day celebrations, the annual Erin Express! There's no cost or cover to join in on the festivities so come out to one of the bars and grab a Bud Light. The bus comes ever 15-20 minutes on a continuous loop for your convenience so need to worry about parking. The pub crawl takes place at the participating bars:

Mill Creek Tavern
Smokey Joe's
The Blarney Stone
Mace's Crossing
Green Room
Gallagher's on the Parkway
Drinkers West
T.A. Flannery's
Bonner's Irish Pub
Callahan's Grille
Westy's
Cavanaughs Rittenhouse

More Location Info: website