Commemorating Genocide in Armenia & Everywhere
24 April 1915
From the Satucket Lectionary
The date 24 April commemorates the Armenian notables deported from the Ottoman capital in 1915, of hundreds of Armenian intellectuals and community leaders, most of whom would be executed, which was a precursor to the ensuing events.
— more at Wikipedia
Although this date is specifically a remembrance of the Armenian genocide, it is clear from the collects that it is intended here to cover all genocides: the killing or harming of people simply because of which ethnic, religious, or national group to which they happen to belong.