Party reservation is a must, who's paying for the food? If individuals are paying then order when you get there. If the host is paying I would defiantly suggest limiting selections and order ahead of time. The kitchen gas a difficult time with orders at prime times. If party is afternoon should not be a problem either way.
You can make reservations. I'm sure if you give the kitchen the orders in advance they can pre-prepare the food, provided you pay for it first. Otherwise just order when you get there.
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