Last year I think they had the convention center food service plus 1-2 outside vendors with limited selections, IIRC.
You can do all your eating onsite, if you're busy, but over 3 days, I would imagine most people will want more variety.
Local stuff was a little tricky. I figured I'd follow my instincts and a major road and wound up doing a lot of driving before hitting anything. Googled sites in advance this time.