Feeling a little miffed right now and wondering if there's a polite way to handle this. Next week we are attending a field trip to a venue that is a fairly big deal, due to venerability as well as distance--it's the sort of place people in our community would likely have to specifically plan for. We are able to take so many chaperones for free who are willing to help out with herding students, but we also snagged a deal with the place that any parents who meet us there and enter with the school will have a reduced ticket price. It is also implied they will be free of any chaperone duties. I have a whole bunch of parents who are perfectly willing to drive down and meet us there, but so far precisely 1 designated chaperone who is attending in large part to help her kid. I get the impression a lot of the other parents won't be too keen on being asked to help out.