C.R.
For my daughter's First Communion, we included the following on the invitation:
In lieu of presents, Xxxx would like to receive monetary gifts which she plans to donate to Give Kids the World and to purchase her first shares of Disney stock.
It took me quite a while to come up with this wording, specifically because we were asking for money. Surprisingly, it worked very well! Everyone thought it was a wonderful gesture.
We have neighbors who adopted two children from Russia. Every year for their birthday, they ask for presents for Operation Shoe Box. They include a flyer/letter about the organization and how to make the shoe box. Works like a charm! Good luck with your little boy's party; I think you are a saint for just having a party with 15 10yr old boy - even before the donated present issue is included!