The point about fog machines and strobes is worth stressing for anyone running a venue in a busy market like ours here in Birmingham. Visibility and staff oversight matter more than atmosphere when players are moving fast through a maze. I'd add that your infection-zone lighting idea works better if the color shift is consistent across rounds, so returning players read the space quickly instead of guessing. The shared-plot approach across rounds also seems smart for keeping a party group engaged for the full 75 minutes without needing constant staff narration.
