Aslef, RMT, and Unite have named strikes for 26-27 January, 15-16 February, and 17-18 February. Each strike is for 24 hours, commencing on the evening of the first day and continuing until the following evening. TSSA's leadership is meeting tomorrow and may join the action.
These strikes are part of the ongoing dispute over pay, terms and conditions, and the "Night Tube" settlement. The company's offer, tabled in November, is pretty shoddy, for reasons we set out at the time.