Cherry Blossom Festival; Dazai Osamu's memorial day
Refers to June 19th, the anniversary of Dazai Osamu's birth and the day his body was found after a double suicide. Primarily a literary memorial day.
On the Cherry Blossom Festival, many Dazai Osamu fans visit Mitaka.
From 桜桃 (cherry) and 忌 (memorial day), named after Dazai Osamu's short story 'Cherries' (桜桃).