Lifelong learning classes on Zoom
Many; example:
https://thelifeinstitute.ca/

Art Your Service
There's a fee but many organizations, such as C.A.R.P.,have bought subscriptions for their members
https://www.artyourservice.org/

The Bright Spot
Run by the YMCA of Greater Toronto
Includes an online book club
https://brightspot.ymcagta.org/

Seniors' Centre Without Walls
Connect by phone
https://www.oacao.org/programs/seniors-centre-without-walls/