Debian Conference
DebConf is the annual Debian developers meeting, an event filled with discussions, workshops and coding parties – all of them highly technical in nature. DebConf15, the 16th Debian Conference, was held in August 2015 at Heidelberg International youth hostel in Heidelberg, Germany.
This year's schedule of events was exciting, productive and fun. As in previous years (final report 2013 [PDF]), DebConf15 features speakers from around the world. Past Debian Conferences have been extremely beneficial for developing key components of the Debian system, infrastructure and community.
If you weren't able to attend, you can obtain the recordings from the video archive.