Zenva have started their first ever Phaser Hackathon! The topic is entirely free, you can make whatever you like as long as it uses Phaser. Submissions must be in by 11:59 PM PST on July 30th and there are lots of prizes up for grabs.
See the link below for more details and the submission form. The competition is open to anyone who uses Phaser, not just those who have taken a Zenva course.