Coming from someone who used to be terrified with public speaking, even in a small classroom when I was in school...it will be ok

My first gig, I was a nervous wreck, but after the first 3 or four songs, I settled in. Playing music live has helped me tremendously with my anxiety in public, particularly where I am the focus and having demonstrate or speak.
You have already practiced, so you will be fine.
If you or anyone makes a mistake, don't focus on that, focus on doing your thing, putting on a good performance, and try to enjoy the moment.