at Tokyo Idol Festival 2015, there will be catering truck called "Tokyo Idol Gelateria", serving Gelato devised by the idol groups performing. On the first day, the menu will have a special Kobushi Factory Gelato called "Gelato Daisuki Kobushi-ya-san" (500 yen)
http://www.idolfes.com/2015/news.html#new0729_2
on the 2nd of TIF2015, there will be a greeting area where Kobushi Factory will be at 5pm
http://www.idolfes.com/2015/greeting.html