A/RES/54/248 Page 2 2. Approves the draft biennial calendar of conferences and meetings for 2000-2001, as submitted by the Committee on Conferences,2 subject to the provisions of the present resolution; 3. Authorizes the Committee on Conferences to make adjustments to the calendar of conferences and meetings for 2000-2001 that may become necessary as a result of actions and decisions taken by the General Assembly at its fifty-fourth session; 4. Requests the Secretary-General to provide all the conference services required as a result of decisions taken by the General Assembly at its fifty-fourth session, taking into account, as necessary, the procedures established by the Assembly in its resolutions 41/213 of 19 December 1986 and 42/211 of 21 December 1987; 5. Reaffirms its decision that the headquarters rule shall be adhered to by all bodies, and decides that waivers to the headquarters rule shall be granted solely on the basis of the calendar of conferences and meetings of the United Nations recommended by the Committee on Conferences for adoption by the General Assembly; 6. Notes with satisfaction that the Secretariat took into account the arrangements referred to in paragraph 10 of General Assembly resolution 53/208 A with regard to the two holidays of Id al-Fitr, which falls on 8 January (to be observed on 7 January) and 27 December 2000, and Id al-Adha, which falls on 16 March 2000, when drafting the biennial calendar of conferences and meetings for 2000-2001; 7. Also notes with satisfaction that the Secretariat took into account the arrangements referred to in paragraph 11 of General Assembly resolution 53/208 A concerning Orthodox Good Friday (which fell on 9 April 1999), which falls on 28 April 2000 and 13 April 2001 in the calendar for the next biennium, and requests all intergovernmental bodies to observe this decision when planning their meetings; 8. Requests the Secretary-General, when planning the calendar of conferences and meetings, to make every effort to avoid simultaneous peak periods at the various duty stations; 9. Reaffirms the provisions established by the General Assembly in its resolution 50/11 regarding multilingualism; 10. Notes that the procedure proposed in paragraph 172 of the report of the Committee on Conferences 1 precludes observers from participating fully in the work of the Committee; 11. Invites the Committee on Conferences to keep under review its procedure regarding the participation of observers; 2 Ibid., annex. /...