The conference for Unity aficionados will be hosted in the Netherlands this year.

Where: De La Mar theater (Training Day), Westergasfabriek (Conference) and Muziekgebouw aan \’t IJ (party)
For whom: Users of Unity, (beginners to experts), and other interested parties
Costs: 400 Dollars, depending on the moment of registration and which tracks you wish to attend. Volunteers get to attend certain tracks for free.
More info: http://unity3d.com/unite/
Purchase tickets: http://unite12europe.eventbrite.com/

Details:
Volunteers may attend parts of the conference free of charge