Brexit isn't going to happen on October 31st.
Here are some events that actually DID happen on October 31st.
1. 475 - Romulus Augustulus proclaimed Western Roman Emperor, the last Roman Emperor
2. 1517 – Martin Luther presents his 95 Theses
3. 1864 – Nevada becomes 36th state
4. 1941 – the construction of Mount Rushmore is completed
5. 1956 – Hungarian rebels establish a revolutionary headquarters and reestablish banned political parties
6. Hallowe'en - or All Hallows' Eve
Hallowe'en celebrates the day before All Hallows' Day, the Christian festival celebrating all the saints