Google's largest developer conference happens once a year, and the dates for 2014 were just announced on Google+.
This year's Google I/O developer conference will be on June 24-25.
Google is also making changes to the registration so that tickets won't sell out in seconds, explains Android boss Sundar Pichai:
Also, quick note for those who want to join in person: this year we’re making some changes to registration, so you won’t need to scramble the second registration opens. We'll be implementing a new system, where you can submit your interest to attend Google I/O 2014. Successful applicants will then be randomly selected and notified shortly thereafter. We’ll be following up with more details from +GoogleDevelopers, so stay tuned.