Aberdeen's third annual Tartan Day kicks off at noon tomorrow with a parade of massed pipe bands along Union Street, followed by a re-enactment of the visit to Aberdeen in 1507 of James IV, featuring a procession of people on horseback dressed in historical costume. A medieval fair will end the festival. As part of the celebrations, Aberdeen Museums will be staging "Meet Jacobite Prisoners" sessions in the city's historic Tolbooth. Aberdeen was an important centre of sympathy for Bonnie Prince Charlie's cause and visitors will get the chance to meet "prisoners", "gaolers" and some "officers" from the King's army in the months just after Culloden. Other Tartan Day entertainment includes a local history fair in the Town House and music in the St Nicholas Kirkyard.