I’m seeing Franz Ferdinand Monday night and I was wondering about the restaurant inside the venue? I usually show up early for gigs to get a good spot but it’s gonna be so cold outside. If I eat in the restaurant will I get in to the venue earlier?

They had chicken fingers & fries the night we were there. And you are correct to go early get some finger food, Good beer and a stool before they are are full.

I do not believe so

Yes. Once you order you'll get a card with a number on it and you'll enter with that group prior to the doors opening for people waiting outside. It's more a bar that has a little food than a restaurant, but the service is good and the food is tasty enough.