I've been google translating this though and it says that The CDs purchased will get you these "activities" I can't tell if it's the CD that gets you in or if it's free?
I'll ask the staff when I go (I just have basic Japanese skills though so I don't know if they'll understand what I am asking). The event I am going to will be set up differently since it's for pre-orders. I think the event you are interested in will require you to have the ticket beforehand, which you can get by pre-ordering the "first press" of the single. I'm just basing this off of how other idols do these events (i.e. AKB, Mano Erina; you already have the admission ticket when you get to the event). You'd just have to make sure that your CDs arrive to you before you are scheduled to leave for Japan. You might be able to buy the singles at the actual event, however most aren't set up like that since the event is supposed to be the incentive to pre-order.
Keep in mind that each event is split in two, each having 6 members. This could be annoying if your favorites aren't scheduled to appear together. This article covers an event they did in May:
http://www.jpcul.jp/articles/view/1742.htmlI would check their schedule to see if they'll have a concert in August, since that would be better than an event.
They'll be streaming something later on today at 8:30pm (in about 4 hours)
あふぃ☆STREAM
afiliasaga