Seijin Shiki is a traditional Japanese ceremony that celebrates young people reaching adulthood at the age of 20. This event typically takes place on the second Monday of January and marks a significant transition in their lives, allowing them to participate fully in society. During Seijin Shiki, participants often wear formal attire, such as kimono for women and suit for men. The ceremony includes speeches from local officials, and many young adults take the opportunity to celebrate with family and friends, reflecting on their journey into adulthood and the responsibilities that come with it.