The best idea would be to give that particular restaurant a call and ask them directly. Then you can't go wrong.
Tell them whose birthday it is in the beginning and then they will bring the birthday girl or boy a hefty piece of chocolate cake. If you want to bring your own definitely call.
When my son turned 21 we had a big family dinner at Olive Garden in Tyngsboro (near Nashua) and they were happy to let me bring our own cake. They didn't mind at all...provided plates, etc. Have fun!
Call them then you will know
We've done this in the past so I assume you still can but probably best to confirm via phone call.
Call them
Hi.. I don't know? But i don't think so.. You may be able to get it for free or at a discount.
Im sorry i don't know that but calling in advance may allow them to accommodate your needs
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