Welsh Festivals & Traditions for Kids Calan Mai for Kids – Welsh May Day Traditions Explained Imagine waking up on the first morning of May. Houses are decorated with green branches. Bonfires have been lit. Children in one Welsh village are carrying decorated branches from door to door, while elsewhere families are preparing for fairs, singing, food and the beginning of a new season. This is Calan Mai — traditional Welsh May Day. Calan Mai in one minute: Calan Mai is the Welsh name for May Day on 1 May . Traditionally, it marked the beginning of summer in the Welsh seasonal calendar. Historic Welsh customs included decorating houses with greenery, lighting bonfires, holding celebrations, children singing from door to door, carrying decorated branches and attending fairs. Different parts of Wales had different traditions. Today, May Day in Britain is often associated with a bank holiday, spring flowers and perhaps a maypole. But ...