Today's service opportunity is caroling, get a group together and go sing Christmas songs to people you know, or Hanukkah carols ,etc. I had the opportunity to go caroling last night and it was a lot of fun. I didn't know the people we were singing to but it didn't really matter. You can bring people a treat when you carol but it's not required, it's a fun seasonal thing, maybe sing to some people who can't get out much, I bet they'd love it.

To go with today's service idea, some research on the origins of Christmas carols: This site tells about them, so does this one.