As you can see from the above list, they certainly take Halloween as a very, very big opportunity for fun events in the US (or at least Los Angeles.)
Of note in the list is this:
Join thousands of participants around the globe for Thrill The World, an annual worldwide simultaneous dance of Michael Jackson's "Thriller." The event begins on Oct. 25 at 12:30 a.m.GMT (that's 5:30 p.m. Pacific time). Find an event in your area. Don't know the "Thriller" zombie dance? You can find an event in your area with rehearsals or you can check out Thrill The world's online instructional videos.That does sound kind of fun, at least to watch if not participate.
It has its own website, and claims that 22,923 people danced this year, yet I don't believe I have ever heard of this before. I suggest Peter Garrett should lead the line up for the Australian version: he hardly needs the make up.