I already posted this in the New York and Ontario meet-up sections, but just in case anyone missed it:

http://www.buffaloirish.com/irishfestival.htm

The 29th Annual Buffalo Irish Festival will be held from Friday, August 28 - Sunday, August 30 (the last weekend of August).
There will be a variety of traditional and contemporary Irish music, Irish dancers, Irish beer, good food, and ... there's something else, but it's escaping me at the moment.

I'll be there Saturday, and possibly Friday night as well.