It is indoor, I think they were talking about the really bad snow we've all had.
As for a website for Sheffield I'm sure there's a 'weebly' site out there for the club which Ive browsed for a few seconds but unfortunately cant remember the http. I do know the Winter Series site but is no help for the club date calendar.
I definitely know racing is on next Friday night though.
Edit: Had a hunt round to find their club site
http://members.multimania.co.uk/sanddmcc/