Dydd Gwyl Dewi Dedwydd!

That had better mean "Happy St David's Day" or I shall be mightily embarrassed.

And it is St David's Day today, the 1st of March, so you should be wearing your leek or your daffodil. (If you're in the 2d Battalion, The Royal Welsh you have no excuse as they've already been presented to you.) You can take part in a parade if you're in Wales, where you'll hear Wales's own pipe band, the Bagad Bro Morgannwg. I couldn't find a picture or a page for the Bagad Bro Morgannwg, but the Welsh Piping Society has a page here.

The collect for the feast of St David in the traditional Roman Rite:

Concede nobis, omnipotens Deus, ut beati David, Confessoris tui atque Pontificis, pia intercessio nos protegat, et dum eius solemnia celebramus, in catholica tuenda fide firmitatem imitemur. Per Dominum nostrum Iesum Christum, Filium tuum. Amen.

Grant, we beseech Thee, almighty God, that the loving intercession of blessed David, Thy Confessor and Bishop, might ever protect us, and that while we keep his feast we may also imitate his perseverance in defending the Catholic Faith. Through our Lord Jesus Christ. Amen.

And finally the DNB tells us more about St David than we knew existed.