Car drift events in July 2013

I will be visiting Japan(Yokohama) next July(7th to 12th)
I am very interested to see any drift events( Formula Drift or similar) in the same time,
I can extend my stay or travel earlier if needed
I did not find teh 2013 calendar on the official site:
http://www.d1gp.co.jp/d1/index_topen.html

Thanks in advance

no event.
D1 schedule Japanese[日本語] page update.
http://www.d1gp.co.jp/d1/gp/gp2013/index.html
http://www.d1gp.co.jp/d1/gp/gp2013/index.html#D1SL

closer date event (not D1)
1) 30 JUN in Kukuru-yomitan circuit (Okinawa PF)
2) 14 JUL in Nihonkai-maze circuit(Niigata PF)

the closest D1GP is august 3 and 4 at Ebisu Circuit (Fukushima Prefecture)