Up Helly Aa is a traditional fire festival held annually in Lerwick, the capital of the Shetland Islands in Scotland. It takes place on the last Tuesday of January and celebrates the Viking heritage of the region. The event features a procession of costumed participants, known as guizers, who march through the streets carrying torches. The highlight of the festival is the burning of a full-scale replica Viking longship, symbolizing the end of the festivities. The event includes music, dancing, and various performances, drawing both locals and visitors to experience this unique cultural celebration.