Holy craaap. There it is.
He says every 3rd Saturday of the month starting in October.
Btw, this guy is
Andrew Tamon Niwa, producer of many idol-related shows such as:
Keitai Deka (all of them)
Tokyo Shojo
Hanbun Esper
Mano Spy
Kaidan Shin Mimibukuro (which includes Mano Erina's movie)
The latest Berryz/C-ute Gekiharo stage show
Ousama Game (with Airi, Yurina, and several others)