I do completely agree that our devices/internet definitely spy on us to the best of their ability. I definitely 1000% agree that AI is more dangerous than aliens. Just think about Terminator (the movie). That could become more than fiction, at this rate, I think.
But, mostly, CalicoBarnCat, there's more to getting an invite in the mail than just cyberstalking in my opinion. Like you said, it was personally addressed to you and they somehow had your personal address. That's odd especially when it's from a theatre and not some massively huge place that would very likely scour the web for any shot at advertising to the proper market. I like to think that if someone puts feelers out there, wants to welcome in knowledge or experiences of the paranormal, it comes their way. A sort of putting energy out and getting feedback, like karma sort of. It's totally crazy that something like that happened to you, CalicoBarnCat. Very neat but jarring at the same time.