I am unsure of why there is a sudden surge of bunnygirl artwork, but I am not one to complain about it.

But it's clearly written on the corner of the image.

八月二日 -> ８月２日 -> Hachigatsu Futsuka -> August 2nd
バニーの日 -> Banii no Hi -> Bunny Day

Notice how Japanese numbers 8 and 2 resemble the katakana word バニー (Bunny). The complete word is バニーガール (Bunny girl).

On second though, Honey Day would make more sense. ハニー -> Hanii -> Honey.