lunch recs near old convention center site
Capital Q (707 H, NW) has Texas barbeque.
Matchbox (713 H, NW) has burgers, terrific brick oven pizza.
Check their menus on-line.
All depends on your bar tab however.
Once you get to that block there's other choices of cheap Chinese, etc. Even some dreaded/dreadful fast food if you run short of time.