Great report Liddo-kun!
Lot's of really good cosplays too, and so much Love Live, I'm rather surprised that it's not actually a Love Live convention.
Also, that's no lollipop, that's Kaladanda, the staff of Death.
The zombie dog thingy is from the game Five Nights at Freddy's, which is a spoof on Chuck E. Cheese style restaurants,
see video for details.