Hinata: Cute ones like with smiley face and a cute sun on it and maybe a few volleyballs

Kageyama: Plain ones as long as he can mark the dates for his volleyball practice and competition dates

Yamaguchi: A calendar that's full of stars :3

Tsukishima: DINO CALENDAR FULL OF DINOSSS

XDDD
I wonder where Tsukishima got those calendars? Maybe he made it on his own ‾\(W∇‾ )/‾

And speaking of calendars
LOOK AT THIS

Too bad its a multi anime one not a full Haikyuu one but this is just amazing (≧▽≦)