Yes, you can for large groups, but for less than 5 people, you are seated in less than 25 minutes depending if it is a holiday or special day. My kids birthday which had 18 people were seated in about 25 minutes which was with a reservation and it was wonderful.
They take reservations for groups. Typically, the wait isn't that long. So you don't really need to make them.
I am not sure. You can call a Olive Garden near you for that answer...
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