JAN. 18, 1985

6 p.m. -- 7:15 p.m. Prelude pageant, followed by fireworks, the Ellipse. Free and open to the public. 9 p.m. -- 11 p.m. Salute to the vice president, American showcase inaugural gala, Washington Convention Center. By invitation. JAN. 19

2 p.m. -- 3:30 p.m. Leadership forum for young Americans. Location and participants to be announced. Free, by invitation. 8 p.m. -- 10 p.m. Concert for young Americans, D.C. Armory. By invitation. 8 p.m. -- 10 p.m. The 50th American presidential inaugural gala, Washington Convention Center. Black tie, by invitation. JAN. 20

9:30 a.m. "A Thanksgiving Celebration," the Washington Cathedral. By invitation. 11 a.m. -- Noon Private swearing-in ceremony, White House. By invitation. 5:30 p.m. National pageant of young Americans, followed by fireworks, Jefferson Memorial. Free, open to the public. JAN. 21

11:30 a.m. Official inaugural ceremony, West Portico, the Capitol. 1 p.m. Private congressional luncheon, the Capitol. 2 p.m. Parade, Pennsylvania Avenue. 8 p.m. -- midnight Presidential balls: The Pension Building, The Washington Convention Center (two balls), Washington Hilton Hotel, Sheraton Washington Hotel, The Air and Space Museum, The Kennedy Center, The Shoreham Hotel. Inaugural Ball for Young Americans: D.C. Armory.