Don’t make an assumption that there will be items available for your use, such as ladders. I recommend asking the venue in advance or just bring it all yourself. The most common things I am asked for are; ladders, extension cables, batteries, power boards, scissors, tape, and man power to lift, move, hold or advise.
During your practice run (# 2 above), determine what tools you will need and put them in a box, or make a list immediately to bring with you on the day. Put in a spare set of batteries, extension cords and power boards, sticky tape and scissors.