Mae Llywodraeth Cymru wedi ysgrifennu i bob ysgol yn y wlad i dynnu sylw at ddigwyddiad eleni, sy'n cael ei gynnal rhwng 16 ac 18 Mehefin, ac i'w hannog i gymryd rhan.
The Welsh Government has written to all schools in the country to highlight this year’s event, which takes place between 16th to the 18th June, and encouraging them to take part.