Works created to celebrate [[Vocaloid]] [[Hatsune Miku]] on March 9th (3/9), also known as Miku Day. Often includes a reference to the [[dated|date]] somewhere in the image.

The number [[39]] is a [[number pun]] on both "Thank You" and "Miku" in Japanese.

This tag was previously named [[MikuPa]] in reference to "Hatsune [b]Miku[/b]'s Live [b]Pa[/b]rty", a yearly event held on 3/9 from 2011 to 2013 where [[SEGA]] and its affiliates put on a giant concert in Tokyo starring Miku.
ミクの日 3月9日 ミクの日2023 ミークの日