Every March 1 day, the Welsh Festival in Britain is also called "St. David's Day". On this day, people celebrate the National Day of Wales with great enthusiasm. According to folklore, when the Anglo-Saxons invaded Wales in history, it was David Saint who led the Welsh people to bravely resist the invaders and finally defeated the enemy. It is said that at that time, David Saint ordered the Welsh to put leeks in their hats to distinguish the enemy and the enemy on the battlefield, and achieved great victory.

Since then, every March 1 day, Welsh people will put leeks in their hats and hold various activities to commemorate this patron saint and national hero. The festival originally set up in memory of David Saint was called "St. David's Day". 18th century, which was designated as the National Day of Wales. Later, in 2000, the Welsh Assembly unanimously passed a resolution to make St. David's Day a public holiday in Wales.

Many celebrations are held on this day in Wales every year, so Cardiff, as the capital, is the most lively. This day is an important holiday in Wales, so many companies and offices are on holiday. On the same day, a large-scale parade will be held in the city center. The Queen of England and the Prince of Wales will also attend the ceremony, and some politicians and star idols will also attend the celebration.

Parades and celebrations are generally composed of two parts, one part is people marching in traditional Welsh-style clothes, and the other part is military music performances. In addition to parades and celebrations, a large Welsh food festival will be held in the city center, with all kinds of local products, snacks and delicious food, and a large concert will be held on the evening of March 1 Sunday. On this day, people can enjoy themselves.