You want crass? We got an invitation from a family that expects us to bring a gift AND a food donation. Both! Then they sent out an e-mail REMINDING everyone that just in case they didn't see it on the original invitation, they should bring food cans to the party. Last time we went to this kid's party, I brought cans and a very cheap gift, thinking the girl was being so generous I should at least get her a little something. But then I realized, they expected a gift, too. The dad said, "This way, she learns that when she gets something, she also gives something."
Ahem. Pardon me, dad, but that is not HER giving something. This is asking the guests to give her something AND demanding that the guests also give her something additional that she can donate. HER giving something would be her getting gifts like every other kid, going through them and then choosing one or two to give to the children's hospital.
Big deal. If this is your definition of crass, you don't get out much.
Please don't attend the party.