Founders Theatre has been forced to close because of safety concerns around the theatre's flying system.
Hamilton City Council chief executive Richard Briggs made the decision today after experts advised the theatre's ageing system poses a risk to staff, performers and the public.
The flying system, first installed in 1962, holds things like production lights, drapes, scenery, and stage effects above the stage using ropes, pulleys and weights. It also holds the fire safety curtain.
An independent health and safety report assessed there was a likely risk of the flying system failing at some point in time. It cannot be easily fixed or replaced without requiring other major work to the 54-year-old theatre.
Briggs said he knew his decision would "create short-term challenges" for 25 groups booked to use the theatre, along with other regular users and ticket-holders.