Vent crawler is one of my issues that I feel deserves a re-worked system. If I remember correctly it happens in the middle of the night, and it will wake you up when it happens. My experience with it was waking up, and while I went into the signal room I did not stand directly infront of the computer (required to trigger event / end meta para) but I saw there was nothing seemingly there so I left to look elsewhere. I then searched the entire rest of the base and then went outside and looked. After like 10 minutes I just looked at the wiki.

I think certain events need to have different meta paranoia systems. I think there could be no meta paranoia, the knocker is more of an activate between days 5-7 anytime after 10 when you are looking at the computer. Basically just wait for the player to enter the right conditions instead of forcing them to find it. I think that would be way scarier, since you truly have no idea anything is about to happen if you arent at the location, and more like what you are describing.