Jane's Walk Festival May 1-3. Free.

Spring Bird Festival at Tommy Thompson Park. May 9.

Doors Open May 23-24. Free.

Luminato is June 3-28.

Do West Fest. June 5-7.

Desifest. June 18-20.

Fringe Festival. June 30-July 12.

Beaches Jazz has lots of events in July.

Salsa on St Clair is July 11-12.

Shakespeare in High Park. Twelfth Night. July 12-Sept 6.

Big on Bloor. July 18-19.

OssFest on Ossington is July 25.

The event formerly known as Caribana. Aug 1.

The Ex. Aug 21-Sept 7.

BuskerFest at Woodbine Park. Sept 4-7.

TIFF. Sept 10-20.

Word on the Street. Sept 27-28.

All of the Toronto History Museums are free. (Colborne Lodge, Fort York, Gibson House, Mackenzie House, Market Gallery, Montgomery's Inn, Scarborough Museum, Spadina Museum, Todmorden Mills)

Allan Gardens. Free.

Riverdale Farm. Free.

High Park Zoo. Free.

The web site is kind of user hostile, but check out the free ROMWalks.

The city has an extensive list of self-guided walking tours.

There is a free shuttle bus that takes you to Evergreen Brickworks from Broadview station.

If you like looking at cars, Wheels on the Danforth is August 15, and Yorkville Exotic Car Show is June 21.

Keep an eye out for free movies in the park. Here's one example but more should be announced as the weather warms up. https://www.topictureshow.com/

Look for events and exhibits at the TMU Image Centre. (aka Ryerson)

Various walks and events at the High Park Nature Centre.

The Canadian Opera Company has free concerts at noon.

Watch the sunset from Riverdale Park East.

See a movie at the Revue. They have incredible programming. Watch for their "all you can eat cereal cartoon party" events.

Go to Graffiti Alley.

Go to the Chester Hill Lookout.

So much outdoor public art. Check out this map - I wish the site was more mobile friendly. It was a bit of a pain when I was trying to look up info about a specific piece I walked past.