According to Mad Catz's MarkMan, Daigo Umehara will not be attending Norcal Regionals 2013 as revealed by the NCR organizer one month ago. Umehara will attend Niconico's Chokaigi 2 on April 28.
Chokaigi is Niconico's huge 2-day fan event that is held at Makuhari Messe convention center (same place as Tokyo Game Show). Anything you see on Niconico, including Internet phenomena, Internet celebrities, or Internet memes, you can see it for real at the event – from video contributors, streamers, vocaloid characters (in hologram concert) to Billy Herrington and alpacas.
The first Chokaigi last year wasn't a commercial success. The event posted 470.8 million yen loss. But it also attracted 92,000 attendees, not including 3.47 million on the web. This year it comes back with more and bigger sponsors.
Chokaigi 2 will be held between April 27-28. The lists of all the booths, stage shows, joint events can be found here.