Stop thinking about perfection! A perfect opportunity to design and present any kind of schematic isn't five minutes long. The idea is to see what kind of use you can make of those five minutes. It's going to be messy, unless you're well accustomed to improvising architecture; it's going to have holes; but that's all okay, because nobody in their right mind would actually try to implement based on what you come up with in that length of time. It's a performance. The whiteboard is a glorified napkin and for the next five minutes you're really enthusiastic about communicating your vision for events booking. Do it in the way you think you can do it best.
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