Memorial Day of Hieromartyr Gregory Bishop, Enlightener of Greater Armenia
Celebrated on 13 OctoberMemorial Day of Hieromartyr Gregory Bishop, Enlightener of Greater Armenia
Other holidays on 13 October
- International Suit Up Day
- World Egg Day
- No Bra Day
- World Thrombosis Day
- Treat Yo` Self Day
- International Day for Failure
- International Day of Skeptics
- Falling Tree Day
- Beatlemania Day
- According to the folk calendar - Mikhail Solomenny
- Friday the 13th Trouble Day
- International Skeptics Day
- International Day for Disaster Risk Reduction
- Day of the Hydrographic Service of the Russian Navy
- Day of Azerbaijani Railway Workers (Railroad Workers' Day)
- Emergency Medical Day in Poland (Dzien Ratownictwa Medycznego)
- Memorial Day of St. Gregory of Pelshem, Vologda, wonderworker
- Memorial Day of St. Michael, Metropolitan of Kyiv and All Rus'