Here is the event description from the Fire Dept. website.
Firefighters from around the region will take part in Seattle’s First Annual 9-11 Memorial Stair Climb on Saturday, September 12 at Two Union Square in Downtown Seattle. As they climb, each firefighter will carry a photo of one of the 343 firefighters who lost their lives in the line of duty in the attack on the Twin Towers on September 11, 2001.
Beginning at 9:30 a.m. firefighters will climb to the 55th floor of the tower twice, representing the 110 stories of the Twin Towers. The 9-11 Stair Climb was organized by Seattle Firefighter Melissa Woolsey and is sponsored by Seattle’s Bravest Charity and the Seattle Fire Department. All proceeds of the stair climb will benefit the New York City Widows and Orphans Fund.