The NCAA bans DraftKings and daily fantasy sports provider FanDuel from their events. In a letter sent Tuesday, college sports’ largest governing body notified executives from DraftKings and FanDuel it would cancel future meetings and ban advertising from the two popular websites during NCAA championship events such as the men’s basketball tournament. Because the NCAA believes the fantasy games meet the definition of wagering, it has decided to ban all advertising, on site and on television, during championship events – a potentially big hit for two companies that have become major advertisers, particularly on television. The NCAA said its advertising…