How can I get involved?
It's time to put your thinking caps on...
Join thousands of people across the UK organising and taking part in colourful, hat-themed events.
Your Wear A Hat Day event can be as simple as posting a hat selfie on Facebook and making a donation - but why not go for something much more ambitious? The bigger, the better. Why not try a Big Hatty Bake-off, Hat Fashion Show or even a Mad Hatter Dinner Dance?
Involve as many people as possible and, above all, make your event fun and memorable.