Not much to add, except a (now) humorous story.
Was on a school tour in Southern Ontario. Hit a massive rainstorm on our way to the school the night before. Okay - had a plan B for if the set got damaged (lots of gaffer tape, screws, drill, and enough time to let a thin layer of paint dry between set-up and showtime). The lead actress then just saw her new pants for the first time and hated them so much she couldn't stop crying. Plan B - already cleared it with the director that she could wear her jeans if she really hated the pants. Got the lighting trees set up and levels done. Let lights run at full for 20 min in case there was dirty power or circuits with not enough power. Plan B - find other circuits, had TONS of extra extension. Everything was fine. Lunch. Get ready, let the kids come in. 10 min before showtime, lights start flickering. My technician checks EVERYTHING including opening up the board to see if there was some weird wiring. No go. Plan B - do the show without lights, already cleared. We were in a cafetorium, so there was enough light. Plan B - call home, arrange to get another lighting board in our next town for the next show. Actors were a little thrown from being able to see the audience, but they got through it. Until 5 min before the end. Choreography got wonky and the actress got hit in the face with the gun, near her eye. I saw she had a bit of a reaction, but then she continued on, so I did too. Went behind the set after the show and there she was, on her knees sobbing uncontrollably. Mostly out of fear. A teacher, who was also a paramedic, came to check her out. She was fine. Decide she doesn't need to help with the tear down and we can do it ourselves (Plan B). 10 min later, she has a panic attack. I decide to take her to the hospital. Now I'm running out of Plan B's. Then she got really bad and didn't know where or who she was. Decided to call an ambulance.
This is where it gets funny, albeit in retrospect. We were on a military base and the message that went out over the radio was that "a student hit a teacher in the face with a gun at the school". Of course, I didn't realize this until 6 firefighters, 4 paramedics and 3 military police officers showed up. I had to show the (fake) gun to each officer individually and show them how it DIDN'T work and wasn't real and didn't even really LOOK real close up. But we still had a trigger lock and lock box for the thing.
Ultimately, everything and everyone was fine. She was just a little freaked out a bit, but laughing again after a couple hours. I had done a ton of "what if" thinking, but there was no way I could have anticipated THAT!!!
Oh...paper props. Always have backups of paper props. And writing implements. They always get lost!