Wikivoyage has its own travel guide to the city with lots of detail.
BlogTO is a hive of vapid clickbait and advertorial chum, but is your best bet for finding out what's happening in the city. Be especially cautious about any headlines like "This Ontario park..." - these could be 12 hours or more outside the city.
Toronto.ca is the official city website. It's a bit hard to navigate, but it's got details for all the municipal facilities (parks/skating rinks/pools/etc) and events.