According to the Roosevelt Island Operating Corp (RIOC):

A 5K and 10K race will be held on Monday, May 27th beginning at 9 AM. Expect minor traffic delays around the F train station and on the East Roadway up to 405 Main Street.

Thank you for your anticipated cooperation.

Sincerely,

Roosevelt Island Operating Corp Advisories Group

More information on the tomorrow’s 5 & 10 K race from NYCRuns:

NYCRUNS Memorial Day Ice Cream Social
NYCRUNS Holiday Series 5K & 10K
May 27, 2013
– Start time: 9:00 a.m. 5K, 9:30 a.m. 10K. Race-day packet pickup begins at 8:00.
Roosevelt Island
Address: Roosevelt Island Roosevelt Island, NY

NYCRUNS kicks off its summer holiday series in style with an Ice Cream Social on

Roosevelt Island! Woo- fricking-hoo!

Time & Date: Memorial Day! Monday May 27th. Onsite packet pickup starts at 8:00 AM. 5K Race starts promptly at 9 AM. 10K starts at 9:30 AM…

Here’s the 5K route map Image From NYCRUNS and click here for more info