Hear stonemason Mark Whyte explain how stone and glass has been retrieved and catalogued for the reinstatement of Christ Church Cathedral.
See Mark in person doing a live demonstration, 12pm to 1pm Wednesday 23 October, Cathedral Square.
There will be other retrieved artefacts on display and expert heritage commentary.
The live demonstrations continue at the same time on Thursday 24 October (stonemason Ben West) and Friday 25 October (stained glass artisan Graham Stewart).