There will be a chance to ride the latest bikes from Bionicon and Cube, as well as skills sessions and tips for beginners.
The event takes place on Sunday, 23 November from 11am to 3pm.
It has been organised in support of proposals to create a new mountain bike trail centre in the area.
Oldham Council will be handing out maps of the planned trail and asking for people’s views.
The demo day is being held at Shaw Quarry, off