Mark Zuckerberg, Peter Thiel, and Warren Buffett walk into a room in Idaho…

It's not the start of a bad joke, just a glimpse of the guest list for Allen & Co.'s annual media conference next week in Sun Valley, Idaho, reported Bloomberg

The Lakeland, Florida-based investment bank hosts the annual high-profile conference, which also counts Google chairman Eric Schmidt, Amazon CEO Jeff Bezos, and Apple CEO Tim Cook among expected guests.

The event, now in its 19th year, is closed to the public, and the schedule is top secret. But for the last two decades, the event has served as a casual gathering for top media executives and billionaires from all industries to discuss deals. And more and more, those billionaires are Silicon Valley’s most powerful players.

For example, last year, Newark, New Jersey Mayor Cory Booker met Zuckerberg, CEO of Face book, at the meeting. Soon after Zuckerberg donated $100 million to Newark schools.

This year, tech investors Marc Andreessen and Peter Thiel are also reportedly expected to show up, in addition to Twitter CEO Dick Costolo, and Yahoo CEO Ross Levinsohn.

Another new attendee on the list is the CEO of video-game publisher Activision Blizzard, Bobby Kotick.