ENGLEWOOD, Colo.--(BUSINESS WIRE)--Sports Authority, one of the nation’s largest full-line sporting goods retailers in the United States and Puerto Rico, held its second annual Sports Authority Football Field Day on Sunday, June 28 in partnership with USA Football’s Heads Up Football initiative. The free event took place at Sports Authority Field at Mile High and included on-field football training and a vendor expo. Sports Authority Football Field Day was attended by over 2,000 people. The foo