SEMA — short for Specialty Equipment Marketing Association — is the biggest aftermarket auto event in the world, held in Las Vegas each fall. This year’s show will take place from October 30th through November 2nd. The show fills multiple convention halls and shows off everything from high-performance OEM specials to custom wheels and graphics from local shops. Here's what we know so far about what automakers and suppliers are up to at the industry's biggest trade show.