Possible Clues:

• Annual Alaskan race
• ''The Last Great Race on Earth''
• Annual Alaskan sporting event
• Race held annually in early March
• Alaskan race underway this week
• Alaskan trek
• Musher's event
• Race that once began in Wasilla
• Mushers' race
• Race that takes a northern trail in even years and a southern trail in odd years