31st St. Patrick’s Day Parade and Celtic Street Fair Saturday, March 17, 2012 Show Us Your Irish Join us in beautiful and historic downtown Billings and enjoy the spirit of Erin Go Braugh during the 30th annual Billings St. Patty's Day Parade. A fun filled day for the whole family, full of food, music, and great Irish tradition. Celtic Street Fair & Entertainment 10 am to 2 pm The Celtic Fair, features food, merchandise and children’s activities Located on Broadway (28th Street) from 1st to 3rd Avenues St. Patrick’s Day Parade - 11 am Regular parade route in downtown Billings up 3rd Avenue North between 27th and 32nd Streets then returns on 2nd Avenue.