A/RES/55/222 4. 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; 5. Requests the Committee on Conferences and the Secretary-General, when planning the calendar of conferences and meetings, to avoid simultaneous peak periods at the various duty stations and to avoid scheduling meetings of related intergovernmental bodies too close together; 6. Notes with satisfaction that the Secretariat took into account the arrangements referred to in General Assembly resolutions 53/208 A and 54/248 concerning Orthodox Good Friday and the official holidays of Id al-Fitr and Id al-Adha, and requests all intergovernmental bodies to observe those decisions when planning their meetings; 7. Reaffirms the provisions established by the General Assembly in its resolution 50/11 and reaffirmed in its resolution 54/64 of 6 December 1999 regarding multilingualism; II Utilization of conference-servicing resources and facilities 1. Reiterates its request to the Committee on Conferences to consult with those bodies that consistently utilized less than the applicable benchmark figure of their allocated resources for the past three sessions with a view to making appropriate recommendations in order to achieve the optimum utilization of conference-servicing resources; 2. Requests duty stations away from Headquarters to keep statistics of requests for servicing of meetings; 3. Reiterates that meetings of Charter and mandated bodies must be serviced as a priority; 4. Decides to include all necessary resources in the budget for the biennium 2002-2003 to provide interpretation services for meetings of regional and other major groupings of Member States upon request by those groups, on an ad hoc basis, in accordance with established practice, and requests the Secretary-General to submit to the General Assembly at its fifty-sixth session, through the Committee on Conferences, a report on the implementation of this decision; 5. Notes the importance of meetings of regional and other major groupings of Member States for the smooth functioning of the sessions of intergovernmental bodies, and requests the Secretary-General to ensure that, as far as possible, all requests for conference services for meetings of regional and other major groupings of Member States are met; 6. Notes with appreciation, in particular in view of the increased requests for meetings of regional and other major groupings of Member States, that services were provided for 84 per cent of the meetings requested by those groups, in spite of the difficulties experienced in the meetings programme in 2000, and that 100 per cent of the requests for facilities only were met; 2