I’d love to know how to stop nerves! I think it’s healthy and shows that the gig means something to you, if you didn’t care it would show in your attitude and playing.
It’s a bit like going into an exam, you don’t know exactly how it’s going to go, but you can control how you prep for it. In this case, learn the songs, rehearse and when it comes to playing the gig try to look up and enjoy yourself!!!! The crowd will pick up if the band are having fun (it’s infectious), literally no one will notice or care if you make an occasional fluffed note.