Good question @progressivechef! My understanding is that there is a team or group of Pipers who fill the nightly role. It's not always the same person.
Next year is a 10 year reunion. It's called the Old Boys and Old Girls reunion. There will be 40-50 different clans and bands represented for that festival. Our hometown normally has a year-round population of 12,000 people. Next year, during the 4 days that the reunion is celebrated there will be 50,000+. It's a much bigger deal than this particular celebration.