Update: The 'Undie Run' took place Friday night in Central Park. 1010 Wins has photos here.
NEW YORK (AP) -- Some 500 runners clad only in their underwear will dash through Central Park in an attempt to break a world record for the "largest gathering of people wearing underpants.''
The current record was set last month by 146 men on an English rugby field.
The Naked Cowboy will be Grand Marshal of Friday evening's 1.7-mile fun run. He'll wear his signature cowboy hat and white briefs. Finishers will receive a pair of boxer shorts.
The run is a warm-up for Sunday's Nautica New York City Triathlon.
Thousands of athletes will swim 1.5 kilometers in the Hudson River, bike 40 kilometers along the Henry Hudson Parkway and end with a 10k run in Central Park.
Finishers receive a medal modeled after the first city subway token.