Has anyone had to bottle feed a baby in a brightly lit room when it was their last feeding before bedtime?

Friday, I have to go to a pinning ceremony for my sister graduating from nursing school. The ceremony is in a church and it's from 7-10 pm. My 4 month old son is fed around 7:30 then goes to bed. How should I deal with that on Friday? Is there anything out there I can buy to cover him from seeing all the lights while feeding so that he can feel it's bedtime and go to sleep? I don't want to put a blanket of my head. There has to be something else out there ???? (And he doesn't take a pacifier so that won't help him sleep)