As a first-time attendee at the INTERGEO conference, one of the largest geospatial conferences in the world, all I can say is "wow."

INTERGEO Conference: Initial Thoughts
by Eric Gakstatter
As a first-time attendee at the INTERGEO conference, one of the largest
geospatial conferences in the world, all I can say is "wow." It's a much
different type of conference than the similarly-sized Esri International
User Conference.

See:
http://www.gpsworld.com/gis/gss-weekly/intergeo-conference-initial-thoughts-10556