When the investment guru speaks, others tune in. Warren Buffett, whose Berkshire Hathaway outfit owns Brooks Running Co. and H.H. Brown, in recent weeks has voiced opinions on everything from the economy and executive comp at Coca-Cola to taxes and tunes, at such events as the company’s shareholder meeting in Omaha, Neb. The meeting, which featured a friendly Ping-Pong game with Bill Gates, set a festive tone that’s sure to carry through to Brooks’ bash in Seattle this Friday. On tap: a morning relay race, product showcases and a party that night.