If you're a fan of Paulo Coelho’s The Alchemist, set aside some time tomorrow to hear from the author.

To mark the book's 20th anniversary, HarperCollins is sponsoring a live interactive web event with Coelho, readers and actor Laurence Fishburne, who's involved in the upocoming movie adaptation. The one-hour program, which starts at 3 p.m., will be broadcast on www.authorsonair.com. 

The publisher describes the event as "a phone-in and online chat that includes an author interview, reader’s calls and a conversation between Coelho and Fishburne." The Alchemist has sold more than 4 million copies in the U.S.