At an unconference, where many simultaneous sessions compete to lure attendees at the same time, coming up with an appealing title for your session is important.
Topics are determined at the beginning of the day by the attendees, and session titles are posted to a wall that attendees look at to make their decisions about how they'll spend their time. It's an agenda crossed with a bulletin board.
The Friday Five: Best Session Titles from Yesterday's Innovation Unconference