MIKU DAYY!1!!!1!1!!

As well as "Good Knee-high Socks Day" and other unofficial Japanese holidays, Miku Day is designated by Japanese wordplay which reads "3" as Mi and "9" as Ku. In similar vein, "39" can be also read as "San(3)Kyu(9) = Thank You" and "San(3)Ku(9) = Thank".

I think im a little bit late but anyways happy miku day to everyone !