OE,

I have been to the one in Philly twice now, kilted of course, and they are a fun night out. Usually there is a representative from Guinness who will talk about the brewing process and stuff, but the main attraction is the good food and of course the Guinness. They have a cash door prize (last time it was $1000) and and other drawings for Guinness gear (usally stuff you can't buy) plus the usual give aways.