''Ground Zero Week'' activists at the John F. Kennedy School of Government at Harvard will pose questions about nuclear weapons strategy to Henry Kissinger, McGeorge Bundy, and Herman Kahn in a special edition of ABC's ''Nightline,'' broadcast live from the Harvard campus tonight (Thursday) from 11:30 until 1 a.m. According to Monitor TV critic Arthur Unger, other guests will include Indian Prime Minister Indira Gandhi, Billy Graham, and Edward Teller, who will participate via satellite.