The festival that involves elaborate costumes and masks, particularly in Italy, is the Venice Carnival. This event is famous for its grand displays of creativity and artistry, where locals and tourists alike don intricate costumes and masks to participate in festivities, parades, and balls. The tradition dates back centuries, symbolizing a time of indulgence before the fasting of Lent. The masks allow wearers to adopt new personas and engage freely in social interactions during the celebrations, reflecting a rich cultural heritage and vibrant artistic expression.