A convention lives or dies on whether attendees can get from their hotel to the hall without thinking about it. We run the loop continuously, on a published headway, for as many days as the programme lasts.
Conference transportation is not a set of trips, it is a service that has to stay up. Attendees do not read a schedule; they walk outside and expect a vehicle. That means headway rather than departure times — a coach every twelve or fifteen minutes from each hotel to the venue, from the first session to the last, with extra capacity stacked around the keynote and the closing reception.