Perception is everything in these situations. If you had that same 150 people in a venue that maxed out at 150, it would have the buzz of a sold-out event. Attendees make judgments like that based not on your actual number, but how that actual number feels in relation to the physical space they're in. Regardless of the solution you choose (see below), you'll want to configure the room in a way that feels intentional and makes people think you were planning on this guest count all along. 1.