They list the showings on the Toyota site. I don't see any new listings other than the Ojai, CA event and the SEMA show on the list. I don't know if they are planning another event prior to the release.
They are planning plenty of events. However, future events are not listed nor will they be, anywhere online. The events are invitation-only. In order to qualify you have to register for "more info" at http://www.toyota.com/fjcruiser/ and live nearby to where the event is taking place.