No but on Google search when you look a restaurant up it will normally give you peak hours and peak busy days. I'd use that as a guide to make a reservation if you're not going last minute. 😁 I think our longest wait was 30 minutes walk in.
No, but it helps in case they are busy when you arrive.
As Joe B said, no, you don't need one, but it's a good idea.
No
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