I think back to my own childhood where my mum occasionally helped out as a spare pair of hands at a school trip and donated something for a raffle.
My kids' school seem to be asking more and more of parents to help out, or in some cases deliver, things that would historically have been the role of the teacher to do. I know times are tough and resources short but surely the answer is to recruit more teachers and argue that the budget needs to be increased for education instead of asking parents, many of whom will work, to step in for a cheap fix.