Youmu-chan gets to introduce her own holiday this time.

Shinjidude said:

Youmu-chan gets to introduce her own holiday this time.

According to the wiki for youmu day, it's supposed to be on 6th April (and the artist also posted one this year on that date post #7423754). Does she have two days for herself?

Alixiron said:

According to the wiki for youmu day, it's supposed to be on 6th April (and the artist also posted one this year on that date post #7423754). Does she have two days for herself?

Most of these holidays are based on Japanese number-wordplay (goroawase).

For "yo", it's more typical to map "4" (with "yo" as it's standard kun-yomi reading), and then "mu" can be "6" (from its "hifumi" kun-yomi reading "mu"). With that you'd get April 6th (for "Yomu") as the holiday date, which is what you're citing above.

For "8" it's more typical for it to get mapped to "ha" from it's typical on-yomi reading, or "ya" from it's kun-yomi "hifumi" reading. That hifumi reading is sometimes also "you" though, as in "the 8th day" which is "youka". If you do that, then August 6th would be "Youmu" and actually closer to Youmu's name since the length of the first vowel matches along with everything else.

I don't know if both are celebrated in practice by Touhou fans, but given Konpaku Youmu is Youmu-kun's spokesperson more-or-less, it doesn't surprise me if he wants to either use the date that more closely matches her name, or give her a second holiday.

Shinjidude said:

I don't know if both are celebrated in practice by Touhou fans, but given Konpaku Youmu is Youmu-kun's spokesperson more-or-less, it doesn't surprise me if he wants to either use the date that more closely matches her name, or give her a second holiday.

Both are celebrated in practice by touhou fans! Its quite fitting I think, given she is split into her human half and phantom half, that she would have more than one day. You can usually find fanart under the #8月6日は妖夢の日 and #4月6日は妖夢の日 tags on twitter.