I'd go for High School Marching Bands in association with the USSBA. Thinking that the honour to be on the grass that special day will be a lifetime memory helping them since they have fought for it which does not exclude what the NFL seems to consider a fundamental link to pop culture which helps broaden the television audience and interest nation wide. Why not both and ask the NFL a pro bono spot in the half time, a service to the nation's youth.
Can't get rid of the image now there is that foggy aqua world with Katy Perry background sound is clearly out of the Bill's rule boundaries. Definitely wild and an unfair practice to get airtime :-))