The theatre space at Heritage Square Amusement Park was originally called Heritage Square Opera House when it opened in 1973 under the ownership of Bill Oakley. Its Children’s Theatre program began in 1990. Actor TJ Mullin took over the Opera House in June of 1988 and it was renamed, the Heritage Square Music Hall. Connie Helsley, President and TJ Mullin produced shows at Heritage Square Music Hall until the theatre closed in 2013.
Here are some production stills from past productions:
Here are some programs from productions:

No Mother to Guide Her - 1977
Where Magazine featuring actors Lynda Holly and Terry Rhoads on the cover, in No Mother to Guide Her presented by Heritage Square Opera House

Heritage Square Opera House Regulars
Cartoon images of the Director, Bill Oakley and the resident cast at Heritage Square Opera House, including Linda Holly, Judith Lane, Stuart Whitmore, Laura Turnbull, Terry Rhoads, TJ Mullin, Bryan Foster and Sy Richardson