I would be interested in attending a pruning workshop with a focus on shrubs and/or trees. Do you know of any in Toronto this summer?
Unfortunately, no courses immediately come to mind but you might want to try the following organizations:
Humber College – offer an Arboriculture Program on Tree Care (https://www.humber.ca/program/urban-arboriculture-tree-care)
Toronto Community Garden Network (https://tcgn.ca/wiki/wiki.php)
LEAF – a not-for-profit community organization dedicated to the protection and enhancement of the urban forest. They engage residents through planting, education and stewardship programs (https://www.yourleaf.org/)
The Toronto Botanical Gardens – offer a variety of programs. On Aug 23 there is a session called Mature Tree Maintenance but it is not specifically about pruning.(https://torontobotanicalgarden.ca/wp-content/uploads/2014/07/Adult-Education-Program-Guide-Spring-Summer-2015.pdf)