HackTO registration has opened with support from Idee, FreshBooks, CanPages and PostRank. Who it turns out all have APIs to use their services:
It’s a great opportunity to bring your laptop, bring your dev environment, connect with other developers, and learn how to build connected applications.

The PostRank team is hosting DevHouse Waterloo on April 26 (this is the 18th DevHouse).
Dev House Waterloo is an event giving programmers and designers the opportunity to meet other creative people and learn from each other – whatever the topic may be. You can bring an idea, or a project you’ve been working on, and present it to the group for feedback or help. Bits will be flowing (wifi is provided), projector will be available, food will be served, and space is provided by PostRank.
Another great opportunity for developers to get together and show off what they’ve been working on.