Many Houston ISD schools will participate in a local bell-ringing ceremony to commemorate the 50th anniversary of The March on Washington and Dr. Martin Luther King, Jr.’s “I Have a Dream” speech. Houston’s official bell-ringing ceremony will occur at 2 p.m. on Wednesday outside Houston City Hall. Houston Mayor Annise Parker has asked schools across the Houston area to join in the observance of this major turning point in U.S. history by ringing their bells at the same time.