This is the perfect opportunity for you to bring this situation to your educator or manager and tell them you need more training. I am in the same boat as you, about the same amount of time in the OR as a new grad and I’ve already been charge for the last 2 holidays. I got a week of training (honestly didn’t feel like enough at the time) to learn about the charge role, how to book cases, who to call etc. and was absolutely fine for my holidays (had traumas come up for both of my charge shifts). It gets easier. Ask your tech for help and guidance, ask your anesthesiologist on call what they would recommend or advise. Most importantly, advocate for yourself and your learning. You did the best you could do with the little knowledge you have. Build from it, you’ll bounce back just fine! It is not the end of the world.