7‑Eleven® brings back its Buy One-Get One (BOGO) Slurpee® drink promotion   IRVING, TEXAS, 2017-Apr-11 — /EPR Retail News/ — 7‑Eleven® wants brothers and sisters to play nice with each other on National Sibling Day, April 10, and slurp it up all week long. That’s when the world’s largest convenience retailer will bring back its Buy One-Get…