Specialty Equipment Market Association (SEMA) of the automobile aftermarket was formed in 1963 by Roy Richter, Willie Garner, Bob Hedman, Robert E. Wyman, John Bartlett, Phil Weiand, Jr., Al Segal, Dean Moon, and Vic Edelbrock, Jr. and now consists of 6,383 companies worldwide, bringing together aftermarket manufacturers, original equipment manufacturers (OEM), media, car dealers, specialty equipment distributors, installers, retailers and restoration specialists.[citation needed]

SEMA provides services for employees of its member companies that include education and professional development, market research, legislative and regulatory advocacy, industry publications, international business development and business-to-business events.[citation needed]

The largest of the SEMA events held annually during the first week of November is the SEMA Show at the Las Vegas Convention Center in Las Vegas, Nevada in conjunction with the Automotive Aftermarket Industry Week. As part of this event, SEMA and other automotive aftermarket trade groups make-up one of the single largest events on the Las Vegas calendar. This auto show is not open to the public. Registration as media, manufacturer, buyer or exhibitor is required.

http://www.semashow.com