Join Twilio for API Hackday Chicago – May 28th` We're excited to announce that API Hack Day is back in action with several dates in the works, including a trip to Chicago where you can hack at MorningStar headquarters. Registration for the event opens today and space is limited, so be sure to sign up. The event is free, but will feature contributions from top companies such as SimpleGeo, SendGrid, Apigee, Mashery, and of course Twilio, who will help you build apps that make phones ring.