Dyngus Day is a Polish-American holiday celebrated on the Monday after Easter. It marks the end of the Lenten season and is a day of fun and festivities, particularly in areas with large Polish communities, such as Buffalo, New York. Traditionally, the day includes playful activities like water fights and the throwing of pussy willows, symbolizing the arrival of spring. Many people also enjoy traditional Polish foods, music, and dancing, making it a vibrant celebration of Polish culture and heritage.