Day of Seven Billion
Celebrated on 31 OctoberDay of Seven Billion
Other holidays on 31 October
- Halloween - All Hallows' Eve
- World Savings Day
- World Cities Day
- International Black Sea Day
- Sign Language Interpreter Day in Russia
- Day of workers of pre-trial detention centers and prisons in Russia
- Books for Treats Day
- Folk calendar - Lukov day
- Pumpkin rescue
- International Hockey Goalie Day
- Dark Matter Day
- Day of red rowan and flying tits
- Celebration of the end of the harvest in Ireland (Samhain)
- Lutheran Reformation Day
- Memorial Day of the Holy Apostle and Evangelist Luke
- Memorial Day of St. Julian the Persian