Photo Marketing Association. They throw the biggest North American tradeshow for the photo retail business and this is where you will find everyone who has anything to sell photographraphy related. Printers, photobook makers, franchises, gear, photo jewelry, photo blankets and other photo gifts... etc. etc. etc. It's a very big deal if you are in the photo-retail business. A chain for example will go in and procure all of their product for the upcoming season. Frames, gadgets, printing paper. Or a lab will go and see the new lines of commercial printers, inks and papers.
I've always lusted after going to this event, but deep in my heart I know I would buy way too much stuff.