1. A method performed by an event management system, the method comprising: hosting a first collaboration event that includes first and second event endpoints that provide respective first and second sets of audio/visual (A/V) media streams to respective first and second sets of attendees during the first event; and while hosting the first collaboration event, reconfiguring the first collaboration event to cause a third event endpoint to provide a third set of audio/visual (A/V) media streams to at least one of the first set of attendees at the third event endpoint.