By Agnes T. Crane The author is a Reuters Breakingviews columnist. The opinions expressed are her own.Wal-Mart pulled out all the stops for its shareholder meeting on Friday. Justin Timberlake emceed at the event, which also doubled as a golden jubilee celebration. Lionel Richie had the arena-sized audience on its feet with “All Night Long” and Celine Dion closed down the party just in time for lunch. It’s a shame the mega-retailer’s organizational skills don’t extend to the basics, like providing more timely color on the controversial re-election of its board.