This will either be the coolest-looking thing, or stupidest looking thing I have ever seen. From the PR:

:

::: SAT: Thriller Dance! ::::
Saturday, October 27
Organized by Allegra Hirschman
Dolores Park on main steps facing Dolores Street
Performance at 3PM sharp
Dancers meet at 2PM

Thrill The World is a worldwide ATTEMPT to break the Guinness World Record
(GWR) for the Largest Simultaneous Dance with Michael Jackson's "Thriller."
Thousands of people in cities around the world will learn the " Thriller"
dance and perform it at the exact same time on October 27/ 28, 2007. To
learn the dance so you can join in on the record breaking performance visit
http://www.thrilltheworld.com/
-David Downs