June 14 is World Blood Donor Day, so consider this your PSA to make an appointment at a nearby donation center. You’ll find this DCist editor at the American Red Cross at 2025 E Street NW this afternoon, downing free OJ and cookies. The Red Cross always has plenty of appointments open — you can probably even stop by today, but you’ll want to call 1 (800) GIVE-LIFE to check before you head down. For…