7-Eleven will celebrate its birthday by giving away millions of FREE small Slurpee drinks on 7-Eleven Day, or July 11. The world's largest convenience retailer is extending the celebration, from July 12 to 18, with 7Rewards Week. During 7Rewards week, 7Rewards members will receive a free 7-Select food or drink valued under $2 with any 7-Eleven cup purchase.