This is stuff that I find useful for Event Organizers.
Working Gloves - at least 2 pairs, i chose 4 „cheaper“ pairs + one leather pair
Tarpaulin - i chose some Painters stuff but only because of the price - future upgrade: REAL tent tarpaulin
a Stapler - because, never leave without it (there is a german saying: „Heb niemals ab vom Acker, ohne deinen Tacker“ - roughly translated to: „Never liftoff, without your stapler“ - totally doesn't works in English this quote)
Duct Tape - at least 4 times 50 Meters, because duct tape. Because! nuff said.
hot glue gun - the Mac Gyver Tool
first aid kits - 2 small ones, one bigger one (one stays at the backstage, two you will give out to your 1stAidFolks) - if you reach a certain size of an event you will have to organize medics, but still - one can never have enough band aids
rubber gloves - for 1st aid stuff
Paper - i have around 1000 sheets, for scribbeling, for printing out notes, etc
small Flashlights - 2, use LED, choose the one with AA Batteries, can be used for outages & for checking folks for concussions
Batteries - AA + 9 Volt Block
Garbage Bags - 2 rolls with 120 Liter black bags, for getting rid of stuff aehm trash
Zip Ties - one bag of at least 120 mm ones, because not everything can/should be fixed with Duct Tape
Twine - around 100 Meters, for Tin Can Phones or other fun stuff. Or just for tying stuff
WD-40 - small can,
Protection Glasses - for Angle Grinding or fun with chemicals
Filter Masks - again, fun with chemicals might not be fun for your lungs
Edding aka Freaking Big Black Marker - for writing on → Paper, to tell people far away in the location where to look for: Toilet, Food, Info, Sessions, etc
Leatherman Tools or equal - 4, for handing out to Roadies/Helpers, to kill Vampires. Or to cut twine. Whatever
Megafon - preferably with a Siren Function. Useful for talking louder than attendees.
Folding Ruler - for hitting helpers or measuring stuff
self retracting tape measure - again, measuring
spirit level - for getting a nice, even perspective, or for setting up an even stage
a rubber mallet - no comment