RE WOW display, the people should be at or around the sweet spot. there is one version of the WOW where the sweet spot is 5m away, and one with the sweet spot 3m away.
so my estimate would be that you can fit about 10-15 people into the sweet spot area at one time.
RE stereo projection, everybody who wears active shutter glasses will get stereo.
you can fit a couple 100 people if you projection screen is large enough (IMAX theater style).
In both cases, stereo will ONLY be geometrically accurate to ONE person out of the whole crowd, namely the one which is axactly at the sweet spot. all others will see a slightly distorted image (barely noticably in the middle, more noticable at the sides of the screens).
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