OKLAHOMA CITY, 2015-12-1 — /EPR Retail News/ — Sonic Corp. (NASDAQ:SONC), the nation's largest chain of drive-in restaurants, today announced that the company will be presenting at the Barclays Eat, Sleep, Play - It's All Discretionary Conference on Tuesday, December 8, 2015 in New York City. The presentation will begin at 8:15 AM ET. Investors and interested…