You're in luck! Eric Bogle is in town Wednesday, Aug. 9. It's a concert or concert/dinner setup. You can email email@example.com -- maybe you can reserve a ticket in advance. Or phone (403) 217-7955. The venue is South Calgary Community Assn.
I had the dates wrong: my daughter's wedding is August 5 (thus no session at the James Joyce that aft., due to the wedding party; but who says the guests won't spontaneously break out instruments...). I leave the next day.
There are also folk & Celtic jams at Friar's Pub, Wednesdays & Saturdays.
That should give you something to go on, for starters.