In Madrid, traditional bands, costumed dancers and performers filled the streets of the Spanish capital as crowds gathered for a festive parade celebrating Irish culture. In Chicago, one of the best‑known US traditions returned as the city’s river was dyed bright emerald green, drawing thousands of spectators along the waterfront. Revelers said the annual celebration reflected both the city’s energy and its immigrant roots. St. Patrick’s Day, observed each year on March 17, began as a religious feast day but has evolved into a global celebration of Irish culture, drawing crowds in cities far beyond Ireland, including Atlanta and other major urban centers across the United States.