Each year at the beginning of September there is a Heritage Open Day Festival. This year it’s happening from Thursday the 8th September to Sunday the 11th September and it will be a great opportunity to see places of interest not normally open to the public.
The program is extensive and therefore it involves being selective, many events though free are bookable. Local programes are available on-line but if you prefer a hard copy program, start searching for them earlier on in August, public libraries usually have them.
Here is an account of one Heritage Festival enjoyed a few years ago.