I believe you can, but I have overheard people calling ahead. Usually to make sure a large group can be accommodated. We usually go during slower hours and haven't needed to.
No reservations but you can call ahead
For larger groups it's recommended. If it's nice weather I would suggest the Patio so that you can hear each other's conversation.
No they don't take reservations but even when they're busy it don't take long to be seated , longest I've ever was 20 minutes. With that being said the food was well worth it.
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