OK - I've got a bit more detail, so I've pasted in below the text I sent to the Arizona Irish Music folks:

"I am going to be performing Irish and American folk music at the Tucson Folk Festival at El Presidia Park on May 4 & 5. I am scheduled to play on Sunday, May 5th at the Courtyard Stage at 5:45 PM. I have also been asked to lead a workshop on the Irish Immigrant Experience in Song (working title) which I expect to be scheduled for a slot on Saturday. You'll have to check the Festival Schedule for those details. For Tucson Folk Festival information please call 520 319-8599. Please come out to the show or the workshop, and please stop to say hello! All the best - Jed Marum"