National Science Week
There are several 'National Science Weeks' around the world but the idea may have started in the USA with the National Science and Technology Week. In India Science Week culminates in National Science Day, which takes place each year on 28th February to commemorate C V Raman's discovery of the Raman Effect. In Australia National Science Week, which began in 1997, coincides with Sleek Geek week.
The United Kingdom's National Science and Engineering Week Week began in 1994 and is organized by the British Science Association. There is a related Big Questions Blog and an online NSEW science and engineering quiz, with topics including chemistry, space, animals and physics.