Well, maybe not magical or mysterious, but this is the place where you can find out where your fav authors are showing up to do book signings or readings.
Booktour.com has two sides: authors and readers. Of course, many of my readers happen to be authors so you'll be interested either way. Authors enter their own information and schedule of events. Readers can look up their favorite authors and see where they'll be.
I found this site on (what else?) an author's blog. M. J. Rose has a nice write up and interviewed the co-owner of Book Tour. Here's Ms. Rose's blog Buzz, Balls, & Hype. She has a lot of good information. Fav her link to keep up on the buzz in the publishing industry.
It you want to go straight to her write-up on Book Tour, click here.