A 24-HOUR candlelight vigil for the homeless is scheduled to begin Wednesday at 6 a.m. and to end Thursday at 6 a.m. at the Strong Blacks Exhibition and Research Center, 1733 Druid Hill Ave. in Baltimore. Donations of non-perishable food items and blankets are requested. Bea Gaddy, a well-known advocate for the homeless, is scheduled to preside as hostess of the vigil, which will include a breakfast for homeless people on Wednesday. For information, call the center's curator, Darryl Van Carter, at 462-2023 or Bea Gaddy at 563-2749.
* Tickets are no longer available for a musical tribute to King scheduled at 8 p.m. on Wednesday at the Meyerhoff Symphony Hall. The free concert, featuring the Baltimore Symphony Orchestra and Morgan State University Choir, will present works by Ulysses Kay, Antonin Dvorak, Leonard Bernstein and many other composers. The celebration is sponsored by the Maryland Commission on Afro-American History and Culture, the BSO and the Governor's office.
* The third annual Dr. Martin Luther King Jr. Memorial Symposium sponsored by the Oliver Community Association is scheduled Thursday at 7 p.m. at Dr. Bernard Harris Elementary School, at Caroline and Oliver streets. The guest speaker will be Father Maurice Blackwell, pastor of St. Edward's Roman Catholic Church. Music will be provided by the Towson State University Gospel Choir. Admission free. For information, call 685-0330.
* Pulitzer Prize winner Taylor Branch, author of the civil-rights movement chronicle, "Parting the Waters," will speak at St. Philips Evangelical Lutheran Church on Sunday at 3 p.m. in a celebration marking the Martin Luther King Jr. holiday. St. Philips is at 501 N. Caroline St. Admission is free and refreshments will be provided. Music and fellowship will be offered as well. The King celebration is supported by the Commission for Multicultural Ministries. For details, call 732-8070.
* On Monday, the state of Maryland's "Let Freedom Ring" ceremony honoring King will begin at 11:30 a.m. in McDowell Hall on St. John's College Campus in Annapolis. At noon, Secretary of State Winfield M. Kelly Jr. and others will ring a replica of the
Liberty Bell; similar bell-ringing ceremonies will occur throughout the country. The event is open to the public. For information, call 974-5521.
* The Rev. Ambrose I. Lane Sr. will deliver a Martin Luther King Jr. birthday address Monday at 4 p.m. at Unity U.M. Church, 1433 Edmondson Ave. Donation is $5; $3 for students and senior citizens. Lane, the host of WPFW's "We Ourselves" program, calls his presentation, "America: Never Again for White Males Only." For information, call 728-4826 or 796-1918.