"Back to Hartley has become a must-do on the calendar, giving visitors a chance to learn about Australian heritage on-location and add their own chapter to our collective history," National Parks and Wildlife Service area manager Angela Lonergan said.

"Hartley Historic Site contains stunning sandstone colonial buildings including an 1837 Greek Revival Courthouse.

"You'll get the chance to look inside the fascinating convict cells and courthouse and see history come to life with demonstrations by Lithgow Living History.

"It really is the perfect setting for this great community event which showcases a variety of hand-made arts, crafts and local produce."

Ms Lonergan said Hartley Historic Site is "an important reminder of our colonial past and nothing beats seeing it teeming with people like it once was".

"The volunteers on the Hartley Historic Site Advisory Committee take much pride in organising this annual event, showcasing this remarkable time capsule in the Central West," she said.

The day will feature pony rides, face-painting and a jumping castle for the kids, as well as displays and entertainment including the St George Brass Band.

Back to Hartley will be held from 9am to 4pm this Sunday, October 27.

The cost is $5 per vehicle, which will go to the 1st Blackheath Scout Group, with small fees for other rides and activities.