This is news in itself, so I'm gonna double post.
As part of the release events for this single, there will be an event called "Sashihara Rino produces: The 1st Yubi Matsuri ~ Idol Special Meeting ~" (指原莉乃プロデュース 第一回ゆび祭り～アイドル臨時総会～)
This is all great and all, but let's look at some details:
Date of event: Monday June 25th, 2012; gates open 17:03
event start time
Venue: Nippon Budoukan
Entrance fee: ￥345
Shiritsu Ebisu Chuugaku (私立恵比寿中学)
TOKYO GIRLS' STYLE
Watarirouka Hashiritai 7
And all it takes for eligibility for this event is purchasing a copy (CD+DVD) of Sasshi's single! (other methods have not been announced just yet..)
Edit: Momoiro Clover Z
has been added to the roster!