April 24 is the 90th anniversary of the Armenian Genocide. Here's a schedule of the events to be held in Moscow on that day, from ArmeniaDiaspora.com (via Blogrel):

10:00 am: Mourning liturgy on victims of the Armenian genocide
Surb Arutyun Church
Moscow, Russia

1:00 pm: Putting on of wreaths in memory of victims of the Armenian genocide
Hachkara on Poklonnaya Gora 

2:00 pm: Meeting at the Turkish Embassy

6:00 pm: Memorial concert devoted to the 90th anniversary of the Armenian genocide
Moscow International House of Music