I’m planning to do a day trip to go scuba diving at GUADEC this year. If you’d like to join me, drop me an email or find me on IRC. There’s a few of us interested in going, so the more, the better! This is not an official GUADEC event. For the official schedule, see this page on the website.
By the way the page for finding room buddies at Residencia Civitas for GUADEC is now up on the wiki. You should go book your accommodation!