Volunteers at Pony Club rallies do not require a background check. I can only imagine how impossible it would be find volunteers if that was a requirement. Who would pay for it? (Do not get me wrong here, I am not anti - safety, I am just expressing how difficult it would be to support this.)
I think about the rallies around here where we even beg the husbands into volunteering because we need more people to help.
Adult members of pony club also do no require background checks.