Planning for Ubuntu releases happens at DeveloperSummit events.

Another popular type of event is the Ubucon.

See also:

• developer sprints, summits and gatherings registered in Launchpad

• UbuntuUsersConference - notes from an "impromptu" BOF session at UBS-MTV

• The BOFHowto is handy for any sessions that involve planning projects or developing blueprints for Ubuntu.

• Wiki pages tagged with CategoryUbuntuConferences