Aimer is confirmed to participate in this year's COUNTDOWN JAPAN, a rock festival held at the end of the year. It will be held on December 28th until December 31st 2016. The events usually take place in Makuhari and Osaka. The schedule is to be decided on early November.

Other than Aimer, you check the other confirmed artists at the official website.

Source: Aimer's Official Website, Twitter, COUNTDOWN JAPAN's Official Website