Whenever members of the Debian project attend an event (conference, exhibition or similar) it should be made public in time so other people, especially our users, get a chance to meet project members, core developers and other experienced users.
In order to make such events public we need to get informed about them. We will create an entry on our events page for every event the project participates. We will try to release a news posting to our news list a couple of days before the event covering this event and the type of participation. (Since we tend to forget about this, you'd better remind us.)
We maintain an external list of upcoming attractions, however, it may be incomplete. It intends to contain all kinds of events that have an affiliation to Free Software, not only those with Debian involvement. However, only events will be added to our own events page when Debian participation is guaranteed. We are not going to provide a general events calendar on www.debian.org.