"Pattern is an Irish term meaning either a saint's feast day, or the various devotional activities that take place on the feast day at sites associated with the saint's life. It is thought to derive from the word patron, as in a patron saint.
A notable example of a pattern takes place on the eve and day of July 24 at Saint Declan's Ardmore, County Waterford. Patterns also take place in Tuosist parish, near Kenmare County Kerry, on July 8, the feast of Saint Killian, and at Urlaur in County Mayo on August 4."
Here is a third colour version for the current chart: