http://flightgear-atc.alwaysdata.net/index.php5
You can go ahead to the Flightgear ATC Events page by Lenny, and register your ATC service for this event. Indicate your time slots as well, and VIVA LA FIESTA JAPAN!!
I did mine already

@ALL PILOTS
Although not an obligation, we, the ATCs, kindly request you to register your programmed flight plans there. Having this allows us to coordinate among different services, and facilitate our task of making more realistic services with delivery included.
Hope to see you all in the Festival Spring 2016 (THIS WEEKEND)
Best,
IH-COL