Bolton Octagon has raised £80,000 after comedian Peter Kay performed three fundraising shows at the venue on Sunday (10 December).
Kay, who hails from Bolton, was a member of the Octagon's youth theatre and worked in the box office for around four months in the 1990s - before being "let go".
Kay thanked the audiences of the 390-seat venue for “coming and supporting a very worthy cause."
Octagon Chief Executive Roddy Gauld told the BBC the event would give the venue "a big boost" and help to keep ticket prices down.
"Running a theatre like this is tough right now," he said.
"Costs have risen, as they have for every business and every household. And as people have less money to spend, that trip to the theatre might be something that they decide to cut down on at the moment.
"So having a big draw like Peter Kay makes a massive difference."