Yahoo shareholders (and perhaps Microsoft and Google shareholders, too, for that matter) might want to consider clearing their calendar for a special event. Yahoo's announced that it will hold an Investor Day/Analyst Day meeting on Wednesday, May 26th. The meeting should last from around 8:00 AM to 3:00 PM California time, and a live view of the proceedings will be available here . Lots of important Yahoos should be on hand and take turns talking, including Carol Bartz,