InfoComm is a trade show about audio/visual (A/V).
For years it has been the place to see projectors. They were famous for their projector shootouts back when projectors were $10,000+ and put out a famous 400 lumens (maybe).
By CES (Consumer Electronics Show) standards it is a relatively small show, which makes it large by most other show's standards.
InfoComm is still the place to see projectors. The smallest is Optoma's 4 ounce "pico" projector (really designed for cell phones, etc) to large Barco projectors that put out 35,000 lumens (felt as bright as the sun, but I'm sure it wasn't) that I'm pretty sure could be used outdoors during the day.
Another interesting set of exhibits are for telepresence. Telepresence is video conferencing on steroids. Most of the demonstration units had 3 big screen (50-65") TV's, with high definition being a recent update, with several cameras and audio conferencing thrown in. Also the systems I looked at had half a conference room table. The screens allow full sized images of the other people so you really get the feeling you are in the room with them. Cisco/HP was one of the really early developers of such a system but at $300,000 per unit (two needed), it wasn't something you were going to use as a small business. One vendor quoted a 3 screen system with everything for about $75,000. It's still not a small business purchase, but the costs are coming down. That system could also link more than one remote site together.
A telepresence variant to the large screen TV's used a slanted clear glass panel to project the other person much like a heads up display on a fighter jet. I suspect that allows a lower cost and makes it easier to mount the camera at eye level, which is important to make telepresence work. It might be fun to try a low resolution DIY version.