What to expect from Sun Valley’s ‘summer camp for billionaires’

For a select group of business moguls, summer camp is about to begin.Starting Tuesday, Idaho’s Sun Valley Resort will be home to Allen & Co.‘s annual conference, with notable invitees from Comcast Corp. Chairman Brian Roberts to Walmart CEO Doug McMillon and Berkshire Hathaway’s Warren Buffett expected to attend.Known as the “summer camp for billionaires,” the invite-only event lets attendees get their fix of both mountain biking and golfing, as well as merger t