XRDC is a very tiny event. It takes place near the end of the year in San Francisco (formerly it was called VRDC, but the industry is expanding and they wanted it all under one roof) and a few dozen industry executives, developers, luminaries, and press all gather together to network, try out a few demos, and attend talks. Mostly it’s for networking and talks though. The “show floor” had maybe six or seven booths total.
As a result, the best part of XRDC for me this year was the Beat Saber talk hosted by Beat Games