@Bopper, I am coming off of ~18 hours of vet scribing at a big endurance ride, and laughing at your comment that your scribes are paid?!?! What?! I felt great being paid with too much pizza for dinner last night, but I can’t imagine being paid 
In all seriousness, often I think organizers that rely on volunteers assume that there has to be some sort of physical token of appreciation, but honestly, how many more t-shirts or mugs do any of us really need? For me, what I really want is clear communication well in advance so I don’t feel like an idiot showing up without knowing what to do and friendly people to spend the day with. I see volunteering as a chance to learn a lot about the sport I’m interested in competing in, so if the organizers can tell me exactly what they need me to do and when they need me there, I’m ready to show up!
Most important to me is having an easy, clear way to sign up. I try to be a good sport but really can’t stand disorganization that starts with the basics of when do you need me, where do you need me, and what is it that I’m doing. I had a friend who wanted to volunteer at the event I was just at, and she received emails and phone calls from three different people who all had different details about what time, what location, and how long they wanted her there, and ultimately, she did not end up volunteering because I don’t think she ever got a straight answer about how long she would have to plan to be there.
As an addendum, I really wish all events/shows would have an online sign up portal so you can see all the details about time/date/location/volunteer “job” description, and maybe even who you’d be volunteering with, when you commit to signing up
I’m on the fence about food. Honestly, I’m a picky vegetarian and I don’t eat what’s put out for volunteers 99% of the time (the pizza I ate for dinner last night was the exception
) - I know people expect it, but I always see food left over and it seems so wasteful. If there’s an on site restaurant or food truck, maybe a voucher to select something, but honestly, I’d much rather not feel guilty about turning down food that I don’t eat. Plentiful water available is helpful, bonus if it’s not in throw away plastic but from a cold, clean source where I can refill my own bottle.
I always forget my folding chair, so chairs to borrow are great.
A lot of people mentioned feeling appreciated, and that’s towards the top of my list too. I feel appreciated when I am prepared for what to expect and know my job when I get there. I feel appreciated when people I’ve met five weekends in a row remember my name or at least acknowledge we’ve met before and re-introduce themselves proactively. I feel appreciated when people recognize that someone new to the sport needs introduction to the rules and the personalities involved. A couple of times this season, I received a completely unexpected email from an official after the event thanking me for coming and mentioning a specific scenario we had worked on together- I was so surprised she took the time to find my contact info and thought about reaching out that way. Something little like that went a really long way to making me want to show up again when I knew she’d be there.