A: London, England, United Kingdom
In October 2012 the first 3D Printshow London occurred.
"Blending technology, art, design and medical applications with a live show that featured music and fashion, it gave visitors a glimpse of the future, where 3D printing will be used across almost every industry. The show sold out completely, meaning that we welcomed more than 4,000 visitors across three days, from industry leaders and prominent technologists to designers, artists and families. With a packed exhibition floor, three sold out live shows, the world's largest gallery of 3D printed art and a series of seminars and workshops hosted by the biggest names in 3D printing, the show was buzzing!" (http://3dprintshow.com/london2012/, accessed 07-08-2013).