Winter residents of Block Island, Rhode Island, have taken a census every Groundhog Day for decades.
The unofficial census is an annual ritual that takes place over beers and laughter, and makes an entertaining diversion during the cold winter months. Dozens of volunteers fan out to count anyone who spends the night on the island. Calls are placed; houses are checked; and the boats are closely monitored throughout the day to see who’s coming and going. [Link]