Monday, March 17 is St. Patrick's Day, celebrating all things Irish in the U.S. and around the world. But it wasn't always a day for partying.

St. Patrick's Day festivities​ were in full swing Monday as people gathered in Wilmington, Delaware, to celebrate Irish heritage, history and community.

People celebrating St. Patrick's Day at an Irish pub in Boston were in for the surprise of a lifetime when pop star Ed Sheeran came in and performed a concert. Sheeran posted on social media Monday night,

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Musical superstar Ed Sheeran played a surprise St. Patrick's Day show at a popular Boston pub on Monday. NBC10 Boston was there as the "Galway Girl" singer performed at The Dubliner downtown. A crowd thronged the bar while he played.