Barry put me in touch with Pat Malham, and thanks to him we now have a -nearly- full listing of "sings" leading up to Christmas and a little beyond. You can see it at the  South Riding Folk Network site:

http://www.folk-network.com/events/2003/carols_03.html

I'll also be updating the Yorkshire Folk Arts listings as soon as I have time. The information will be the same.