We have a party of 12 on Dec. 10 at 6:30 pm., do I need a reservation for this large of a party?

Call them

Arretta, You need to ask the location that question. The general public wouldn't know their policies.

Great place to eat

you don't have to have a reservation however if you're going with a group of 12 it would probably be best to let them know at least ahead of time so they can have the tables together for you