 To enter the Great Grand Slam giveaway, text BASEBALL to 208-522-5900. The winner will receive a trip to Seattle and tickets to two Mariners games. The War Bonnet Roundup is back, saddling up for the 112th year of ground-shaking, heart-pounding action. Bigger and better than ever, July 31st till August 3rd with a free family kickoff event Wednesday night at Sandy Downs.