In order to support conferences at the scale of those associated with this wiki
Of course, a major limitation for any in person conference is the meeting space itself. There are limitations on both number of rooms and room sizes. Note that limitations may also be placed by the local fire marshall upon the layout of a space in order to ensure proper egress capability. This is especially true for poster sessions where space around the posters will be required to be large enough such that an emergency evacuation can remain orderly.
Managing room assignments, especially for workshop sessions, requires predicting the number of attendees for a workshop. These predictions must be done before all the speakers and presentations in a workshop have been formalized and so may vary widely from the actual attendance in a workshop.
One of the major costs for a conference is the catering budget. This means that managing this is important to keeping registration prices down. Most conferences only provide coffee breaks with light snacks during the main conference. Breakfast, lunch and dinner may be provided but usually are not included with the conference registration in order to keep registration costs down.
If a workshop or sponsor wishes to fund their own catering this may be possible but it's important to check with the conference executive director about limitations. Some conference centers may require that all food be provided by a specific caterer and violating these rules may result in contract penalties for the conference.
All conferences provide meals for people with some dietary restrictions. Usually these meals need to be arranged in advance and are only available to attendees who have identified the need in advance. Attendees with a dietary restriction should make sure their restriction is identified in their profile on the website.
Almost everything in a conference center needs to be ordered in advance and planned to be available in a given location at a given time for a conference. This includes internet access, audio/visual equipment and staff, furniture and even an electrical outlet. The conference will provide some of the basics for this but it's always good to check with the staff particularly if you expect additional needs.
It is important for organizers not to move furniture and audio/visual equipment for their individual events. This may disrupt the setup for following events.