H.Protagonist
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EDIT: Some of the fanfic stuff reminds me of being in high school. The doors of the bathroom stalls filled up with this violent rape fantasy fanfic about our music teacher. Reaction among the guys was like 'who is the fucking wacko doing this?' but we thought it was pretty funny all the same, just the silliness of it. I certainly thought it was a joke made in bad taste. Of course it was found by a teacher who needed to use the students toilets one day and all hell broke loose. The teacher involved was shattered, and left her job. I remember seeing her coming out of a meeting crying. Sweetest fucking teacher you could ever have, literally cared about nothing more than her students, and repaid with this. And I'll be honest I just couldn't see the harm it would do until it was done. And then I felt really, really sick for a long time. Anyway once that happened enough people felt so bad that the guy's name got through to the head and he was found and expelled. Straight A student, prefect, all that jazz. Crazy.
They're just words, but they do more damage than you might think.
The scary part about the fanfic thing, and like with the guy knowing the address in the first threat, is that sometimes they have details they shouldn't know. It's not just a fantasy or fucked up email or just 'words' anymore. It's dangerous and frightening. For example, the fanfic I got knew what perfume I wore. The perfume I wore during that time I'd brought with me when I moved and I rarely wore it. It wasn't super common either. That's scary as shit.
If somebody gropes me at E3 and I know who it is I will call them out on it.
Good on ya. Calling it out when it happens is important, and security will back you up (as will plenty of others). Don't stress about it, though. There are lots of awesome people, and I think you'll have a great time.