After giving birth, when is it okay to go to a concert?

My baby boy will be here on October 31st, and my partner and I have tickets already to go see our favorite band which is on November 21st. We never do anything besides go to concerts, never really had a social life outside of them. I know with our precious boy coming, we have a lot to give up but we are hoping going to a concert once in a while doesn't have to be one of them. The concert starts at 7 PM and will most likely last 3-4 hours at most. There's also a chance my baby boy will be here sooner than the 31st because I have gestational diabetes and he is a big boy, I just have a feeling he will make his arrival early :)