Shwmae Sumae Day (Welsh: Diwrnod Shwmae Sumae) is a day marked each year in Wales to celebrate and promote the Welsh language.
[1] Shwmae and Sumae are informal greetings used in the south and the north respectively to start a conversation.
Shwmae Sumae Day events are organised at grassroots level by individuals, organisations and schools, and co-ordinated by civic Welsh language umbrella group Dathlu'r Gymraeg.
[5] The day is promoted through 'champions' appointed each year, many of whom have learned Welsh as adults themselves.
[6] Schools and other educational institutions play an active role in the day creating videos and promoting the day on social media.