Raspberry Day, also known as Cavernoma Awareness Day, is observed worldwide every September 20. This day was established in 2020 by the Cavernoma Society, a UK-based charity, with support from the European Federation of Neurological Associations (EFNA). The day aims to educate the public about cavernomas, which are benign malformations of dilated blood vessels in the brain or spine that resemble raspberries. Participants can engage by learning about cavernomas, hosting raspberry-themed events or fundraisers, donating to relevant organizations, and sharing information on social media using the hashtag #RaspberryDay. The observance highlights the need for awareness and research into the condition, which affects about one in 100,000 people annually.