Total: 8
My wife, myself, and 6 other people, maximum. Not that we don't have room for at least 30, but there is also the consideration of noise level and activity. I would not be comfortable with 28 other people in the house, and would likely find an excuse to go someplace else.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.