Currently, the standard and essential requirements are :

0. Block booking in a recommended hotel as near as possible from the meeting.
1. a room for a sufficient number of delegates, arranged in U-shape;
   possibly ad hoc rooms, even if not in the same building, for subgroup work.
2. extensions and plugs for half the number of people (average carrying a
laptop
   nowadays).
3. 2 printers with Postcript capabilities (suggestion: HP laserJet 4)
4. 1 PC currently with  Windows 3.1 at least, WinWord 6 at least (to be
revised
   with software and hardware evolution).
5. possibly (optional) 1 access to Internet and possibility to plug laptops
   in rooms for private Internet access.
6. support people for the hardware/software installed in case of problem.
7. if the room is large, loudspeakers and one microphone per 2 persons, plus
one
   for the chairperson.
8. At least 2 coffee breaks a day, with tea, coffee and juice in the morning
   and soft drinks in the afternoon, with cookies, or muffins, or danish if
   budget permits. If budget permits, muffins/danish and coffee, tea, juice
for
   the arrival each morning.
9. 1 high-end photocopier (recto-verso reproduction plus automatic feeder
   and automatic stapling with enough paper and staples.
10. a photocopier operator.
11. a social event per meeting.
12. a package giving practical information about the city and the area,
    including a restaurant list.
13. find appropriate persons to introduce the meeting.

Plus being able to answer such requirements as (prtacical experience):

14. special reservation requests
15. special letters of invitation to ease visa obtention by certain
    nationalities (this was required by the Canadian Embassy in Beijing for
    the Chinese delegates this time)
16. not hold a meeting in a country where there are racial/national
    restrictions: a few years ago, Jordan canceled an already given visa to
Isai
    Scheinberg, Canadian resident, because they discovered he was a Jew
    (in fact he is a Russian-origin Jewish Lithuanian, a situation badly
    accepted in Russia because he is Jew and abhorred in Lithuania because he
    is of Russian origin, the reason his family moved here!!!!)
17. give information in advance to delegates about tax refund possibilities,
    about electrical and telephonic plug standards
18. be prepared to get train, plane, bus schedules to delegates who need to
    come/go to/from the city from third destinations.