I always take the following to any all day outdoors summer function:
Small Emergency Pouch Containing:
Moleskin
Itty Bitty Stainless Steel Folding Scissors
Safety Pins
2-3 Adhesive Bandages
1-2 Alcohol Wipes
1-2 Single Use First Aid Cream or Antibiotic Ointment
1-2 Splinter Remover Tool
1-2 single use each antacid, pain reliever, allergy medication of choice, antidiarrheal
1-2 Blister Pads
1-2 Hair Ties
Comb
My emergency pouch is about the size of a snack sized Ziploc baggie so it takes up little room. Wide mouth water bottle, phone and charger in ziploc baggies, sunscreen, large clean bandana, cheap ponchos, and bug spray round out my prep. I bought a bug spray that is a spray container about the size of a fat ink pen and I just refill it. Someone always needs moleskin, or gets a splinter, or falls and mildly scrapes a knee. Often that's me because I'm clumsy like that.

Having these things means we don't have to go find the first aid station every time I trip over a toothpick dropped on the ground. Or my own feet. I find a bandana can be very multipurpose. I use it as a cooling towel, to tie hair back as a headband, to wet and use to wash a child's face, to wrap something up and tie it to a belt loop to make carrying easier, and I will probably think of other uses right after I post this comment.



A few spare zip baggies never go amiss. Someone always needs one for the phone for the water rides if nothing else.