Currently the Durham Potters' Guild does not offer pottery classes.
However the following members and organizations do provide classes.
Whitby Station Gallery
Whitby, Ontario
https://www.stationgallery.ca/programs/studiopottery
Arts Resource Centre
Oshawa, Ontario
http://www.oshawa.ca/things-to-do/arts-culture-and-heritage-programs.asp
Visual Arts Centre of Clarington
Bowmanville, Ontario