WEEK-END ACTIVITIES

NYRR THURSDAY NIGHT AT THE RACES 2009{CQ} The second of four indoor track races for those 19 and older, with lengths from 800 meters to two miles. Registration, 6:15 p.m. Races, 7 p.m. Sponsored by the New York Road Runners.{cq} New Balance Track and Field Center at the Armory{cq}, 216 Fort Washington Avenue, at 168th Street, Washington Heights{cq}, (212) 860-4455{cq}, nyrr.org{cq}; $10.

URBAN TRAIL CONFERENCE{CQ} Sunday at 12:30 p.m., a hike of more than four miles in the South Bronx, meeting in Manhattan at the Bx15 bus stop at 125th Street and First Avenue. (212) 924-7486{cq}, urbantrail.org{cq}; $3.{cq}

CELEBRATE THE DREAM{CQ} Monday at 6:30 p.m., a tribute to the Rev. Dr. Martin Luther King Jr., presented by the JCC in Manhattan, with performances by the klezmer clarinetist David Krakauer, the trombonist Fred Wesley, the soul singer Kyle Rifkin and the rap artists Socalled and C-Rayz. There will also be a video presentation, and remarks by the city comptroller, William C. Thompson Jr. {cq} Symphony Space{cq}, 2537 Broadway, at 95th Street{cq}, symphonyspace.org{cq}; free.

Tags: HARLEM, WASHINGTON HEIGHTS, BRONX