I'm not sure whether I can have three but the first one's very short.
My brother, four of my cousins (from different branches of the family) and my late aunt have birthdays on 8th, 9th, 10th, 11th, 12th and 13th of October = different years, obviously!
The second coincidence is this. I had a peripatetic life with a father in the armed forces so I attended a lot of schools. I joined the WRAF myself and served as a teleprinter operator. I married an airman in 1972. More moving. In March 1974 he was posted to Cyprus.