I explored a large building in Village of Nyght and the zombies didn’t follow me in. In one of the basement areas my profile picture was displayed on a screen along with my name.
Halloween is a big deal in Second Life. Last year I was focused mostly on the Legacies 1891 sim and didn’t get out for Halloween inworld. There are interesting wordpress blog posts about the Halloween sims and late one evening I visited one. I was the only one there and opted not to use the zombie-killing HUD offered. The noisy zombies followed me around and kept bumping into me and made me smile as I ignored them. There were other things to see as well but mostly I remember the zombies.