My brother, niece, and I just got interviewed about the concert.
So the concert was solid of course. The difference in girls like Masaki, Haruna, and Eripon in how they dance. They've grown up a lot and look very adult. Eripon made up for borderline ignoring me when I got her autograph. This crowd didn't have that New York intensity but that what happens when it's an anime con and you have non fans.
Don't know how serious he was but the guy who runs the con said something about having them back next year. Mizuki also said "I'll be back!"