On the Goldcast platform, you can host up to 30 people on stage or in a room at a time. This help doc will show you screengrabs of how your event could look like once you go past the six "talking heads" framework.
Note: Webinar events do not have networking rooms or booths. While this is the case, they can host up to 30 people on stage at a time.
And here is what 30 speakers look like on the stage at one time: