Opposition councillors say they want to see the figures that justify the spend at a pier.
'You know who you are,' declared the actress, at the end of her West End performance in Inter Alia.
Hull Truck Theatre and the Albemarle Music Centre will be hosting the family day next month.
Vikki Stone says she is "incredibly proud" to have worked with local talent from the East.
Ian McEwan's novel has also been made into an Oscar-winning 2007 film starring Keira Knightley.
Cumberland Council says works to the roof and the auditorium will be finished by mid-June.
The 120-year-old venue twice survived potential closure and will now reopen after a four-year renovation project.
The major project could take months to complete.
David Lindsey steps down after managing Middlesbrough Theatre for almost 27 years.
