It looks like the very indie con, Ninja-Con is gone, replaces with Ronin-Con. From the press release, the CEO and the organization behind Ninja-Con was going for more of an arts festival than an anime convention, but the Ninja-Con committee still wanted to keeping striving for anime fun, so they amicably have separated.
Ronin-Expo replaces Ninja-Con, but will still take place in Little Tokyo at the JACCC and will be staying in June, the 10th to be exact. We will have more details as the new event draws closer. We doubt it will change much as a small fan led anime event.
To register for the event early and save some money or to start finding details go to the official site.