First off, this is not something that has been discussed with StackExchange. This is a community thing that has no official backing at this point.
Would there be any interest from members of the community to run/participate in a charity event for Child's Play? If there is interest, I would probably take the same approach as the meetup and plan it in parts via meta questions. I am willing to help facilitate, coordinate, run, organize, whatever, but I wanted to see if there is community interest in doing something first.