There's a summer VK festival in Tokyo and Osaka; Scuber Dive. It's divided into "Shibuya ga Taihen" and "Naniwa ga Taihen".
The Shibuya one will be on August 3rd at O-'s East, West, Crest, Nest, Duo Music Exchange, and club Asia. You buy one ticket for the whole day and can get into any of the live houses.
There's no timetable yet, but here are the bands that are going to be in Shibuya on 8/3:
Aikuru, Ashe, Administrator, 12012, M, Elm, Gizmo, Zoro, Dali, Deathgaze, Duel Jewel, Tokyo Michael, NaiL, Nega, Hacchi, Lolita 23ku, Art Cube, Aoi, ALSDEAD, Gilltia, Jully, Juliet, Danger Gang, NightengeiL, heidi, Hi:BRiD, boogieman, Arc, Vanessa, Varna, Vidoll, Kalvary, Clear Veil, Dog in the Parallel World Orchestra, Heisei Isshin, Moran, Lycaon, counting a sheep, Kelli, Dhalis, Chariots, Dio, Hana Shounen Baddies a.k.a. Billy, Megaromania, meth, Layla, and CHEMICAL PICTURES wassup