Well at least mine!
First aid kit... but really band aids and mostly for vendors and couples blisters from un broken in shoes!
Safety pins - For everything
Spray deodorant - Trust me. Under that dress
Glue Runner Tape
Battery Pack - Because my phone will die without it
Scissors - from dress tags to packaging.
Zip ties! - They have a million uses.
I know seems simple. If you don't have a coordinator make you to have these items handy on the day of!
And off!
Emergency Kits MUST HAVES