The bulk update request #8600 has been rejected.
create alias cirno_day -> character_day
create alias nue_day -> character_day
Even 9/9 being a prominent one the idea for a specific character's day is not exclusive to Cirno, with other characters getting an special day given by fans based on her name or another characteristic from that character
1/6 - Reimu's Day (Pixiv: 1月6日は霊夢の日): From reading her name - Rei (0, on'yomi) i (1, on'yomi) mu (6, kun'yomi)
6/9 - Patchouli's Day (Pixiv: 6月9日はパチュリーの日): From reading the catchphrase mukyuu - mu (6, kun'yomi) kyuu (9, on'yomi)
6/9 - Shingyoku's day (Pixiv: 6月9日はシンギョクの日): Since one of her shapes is the yin-yang who resembles "69"
As (i suppose) this probably is not exclusive to Touhou, I propose migrating this to an "more generic" tag that can be used for any "character day" (xxxの日）and not specific for A's day, B's day, etc...
ps: I wasn't sure if I send as alias or implication so I sent the first