any support or help for Foster who need Holiday?

here is our story. we are a couple with two small children (under age of four) that are bio. we have no home study. I am wondering if any of you know of any service that helps kids without families or homes on Holidays. I would not be opposed to inviting some for Thanksgivng and Christmas. is that dumb? crazy? do any agencies do this? If that's too "off" how about how can I help them in their environment? I have an awesome Church who'd reach out too.