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* Consider a winnowing process for pre-conferences to limit them in advance of registration to the number of rooms that you have. Could either do advance voting like with talks, or say that you have x number of rooms and take the top x pre-conferences, etc. We set a 5-person registration minimum for A/V support this year, and found that all the pre-conferences met that limit (all 19 of them!) so it was not particularly useful.
* Ask ahead of time to find out if pre-conf organizers are planning to open their pre-confs to non-conference attendees.