On May 18-19th I'll be at the Edinboro Highland Games, but that's a bit of a drive for everyone else.

While I think of it, here are some other events this summer:
June 22-23 Hamilton Highland Games
August 10 Fergus Scottish Festival
August 18 Amherst Scottish Festival & Highland Games - Glengarry Bhoys were at this one last year ...
August 24-26 Buffalo Irish Festival - Glengarry Bhoys, Barleyjuice, Seamus Kennedy, the Leftovers - I arranged vacation for this one.
Sept 7-8 Fort Erie Celtic Festival (Loch Sloy)

I'll try to remember to add these to the Calendar as well.