IRVING, 2017-Aug-17 — /EPR Retail News/ — Dust off your sand buckets, punchbowls, beach cups or other unique containers. The highly anticipated Bring Your Own Cup (BYOC) Day is back at participating 7‑Eleven®stores Aug. 18 and 19, from 11 a.m. – 7 p.m. each day. On BYOC, Slurpee® fans can fill a cup, or container that can…