Changes

Selecting the speakers for the TEDx event and what they should speak about is up to the person(s)/team running the event. The content of the event is open to any theme. For an innovation TEDx event, it would be benefeical to choose speakers that are entrepreneurs or experts in that field. 

A TEDx event can be hours to a day long. However one wants the duration of the event to last probably depends on the amount of speakers and the allotted time they have to speak. Basically, the event is structured with speakers who can speak in front of an audience. Typically, the speaker is on stage facing the audience. Moroever, these events are traditionally filmed and streamed online. Thus, the speakers should not have a problem being filmed.