Wear A Hat Day is Brain Tumour Research’s annual event raising money to bring hope to brain tumour patients and their families. Every March, as Brain Tumour Awareness Month comes to a close, people from all walks of life put on their favourite hat at work, in school, with friends and family, and hold hat-themed events and make donations to help find a cure for brain tumours, which kill more children and adults under the age of 40 than any other cancer.