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.)
Events will only 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 but you can find some general Free Software events calendars at the FSF, FSFE and LWN websites.