After 10 years it’s back:

“The IYOR is celebrated worldwide to raise awareness about the value and importance of coral reefs and threats to their sustainability, and to motivate people to take action to protect them.
Singapore will be celebrating along with 50 countries around the world to celebrate our reefs! In fact, all the reef-loving groups in Singapore have come together to dedicate 12 months of round the year events to celebrate the amazing coral reefs we have in Singapore!”

Details on what’s going on can be found here.