Launched in 1995, World Spay Day is an annual campaign that aims to encourage people to save animal lives by spaying and neutering companion animals and feral cats. World Spay Day itself is celebrated annually on the fourth Tuesday in February (February 23 in 2021), but your event, no matter how big or small, can take place anytime throughout the month of February, which is recognized as Spay/Neuter Awareness Month.