National Random Acts of Light Day is observed worldwide every year on June 13. Founded by The Leukemia & Lymphoma Society, this day aims to "bring light to the darkness of cancer" and emphasizes the importance of blood cancer research. The day encourages individuals to perform random acts of kindness for cancer patients or survivors, such as surprise visits or thoughtful gifts. The first observance took place in 2017, inspired by a campaign where celebrities would unexpectedly visit blood cancer patients to offer encouragement. The Leukemia & Lymphoma Society, established in 1949, funds significant research into blood cancers, which include leukemia, lymphoma, and myeloma, and supports patients and their families. Participants can also spread awareness on social media using the hashtag #RandomActsofLight or donate to charities focused on cancer research.