1-3 October, the event, IEEE Tabletops and Interactive Surfaces 2008, will take place in Amsterdam, Holland.
This will be one of the more interesting events of 2008 related to multi-touch technology, where people from the industry and the academic world meet each other.
Quote from http://www.ieeetabletop.org/ website:
"About Tabletop 2008
The use of the tabletop as an input/output device is an exciting and emerging research area. This cross-disciplinary domain brings together experts in projector based display systems, augmented reality, user interface technologies, multi-modal interaction, input and sensing technologies, CSCW, and information visualization."
Natural User Interface (NUI) will be present at IEEE Tabletop '08.