I believe the following is correct – let me know if there are any inaccuracies:
Tue 26th Dec (Evening): Closed (despite some people wanting an excuse to escape, sorry!)
Wed 27th Dec (Afternoon): Closed (as David has already indicated)
Wed 27th Dec (Evening): Open as usual
—
Tue 2nd Jan (Evening): Closed
Wed 3rd Jan (both): Open as usual

Update: the workshop is CLOSED tonight (Tuesday 2nd Jan)