Judging by the seating diagram, most seats are at shared tables, some are at the bar and some are at side rails. Dining is NOT required. I'm guessing some folks show up early and have dinner, either upstairs or downstairs, and some don't. It might be best if you carefully review the web site and the FAQs. Personally I'm always anxious at new places, I hate that. No dinner for me upstairs there, I'd be uncomfortable no matter what. I suppose I'll eat someplace else before, and get drinks, strike up a conversation with others, and maybe a snack like chips at my table. Best option is always to do whatever you want to do; for some that's easy, for others it's nerve-wracking. I find a drink in hand is both calming and creates a space. Enjoy!