I think this might be a parade but that does not answer the questions that this photo brings up.
Why are those two people sitting in the van? 
Why is that man not committed to having his shirt off? Is that a comb-over he has happening? Although I do miss the days when men actually owned that they are hairy creatures instead of waxing themselves.
Do all of those kids belong to that woman? Or do they belong to some of the adults?
Furthermore why did Nancy take a photo of them?