For the Boise venue I discussed with some of the local residents an estimate of how many would attend. The estimates ran from 65 to 150. As a result the venue chosen was for 400, anticipating there would be plenty, even some empty seating. I've now been told there may be a number of non-local attendees, which may exceed the seating.
All seating is first-come, first-seated. If it turns out there are not enough seats, the recording is going to be available in near real-time. The people doing the recording plan to have the first hour (75 minutes) put on CD's at the location and made available at about 90 minutes into the talk. The concluding portion will similarly be released about 15 minutes after it concludes. Therefore, assuming the equipment works as hoped, recordings will be available before the talk ends. I'm not involved in any of that, but this is what is planned by those who are doing the work of providing the recordings.
This is the plan for releasing recordings at all locations, but I hope there will always be enough seating for anyone who takes the time to attend.