I'm not as sure about the Fear Street pop up, but most of the horror media pop up events are done by JFI Productions, the same people who put on CreepLA. I know for sure they did a media pop up for the recent Halloween movie, and an "I Know What You Did Last Summer" pop up for the series. While I didn't attend them personally, people who did get to go raved about them, and I have been to many of the CreepLA events, and they're pretty amazing. But it's more of an immersive experience than a HHN maze, so I'm not quite sure it's fair to compare them.