anniversary of Shiki Masaoka's death
Refers specifically to the memorial day for the haiku poet Masaoka Shiki, observed on September 19.
Today is the anniversary of Shiki's death, so let's read some of Masaoka Shiki's haiku.
From 子規 (Shiki, the pen name of Masaoka Shiki) + 忌 (memorial day).