Mauvais said: Nagato has her own convention? I didn't know they had entire cons devoted to characters.
She shared her third con with Kyonko though. And Asakura had two already as well.
Each had roughly a hundred circles participating. So it's nothing compared to Comiket. But out of all these releases, only ONE book got scanned so far. It's a damn shame. I guess the low profile of these cons makes the items sold very rare, and hence too expensive to break for scanning. (Although the large majority of Comiket releases never gets scanned either.)