Today it is announced that Kobushi Factory, Up Up Girls, Ciao Bella Cinquetti, and Kikkawa You are invited to perform at one of the biggest 3 day music festivals of the year, "Sports of Heart Music Festival 2016" on 10/14~10/16 at Yoyogi National Stadium First Gymnasium. Anisong, Voice Actors, Idol, JPOP, KPOP, national and international artists are gathered to perform.
https://www.atpress.ne.jp/news/108271
Oricon article talking about upcoming Idol Festivals this summer, and featuring some idol groups that should have your attention : Kobushi Factory
http://www.oricon.co.jp/special/49168/