LALITPUR: A three-day National Referee Seminar and Refresher Course organised by Nepal Taekwondo Association began here on Tuesday. A total of 256 participants — including 85 in seminar and 171 in refresher course — from Central Region are taking part in the event conducted by South Korean trainer Kwan Yang Dal along with local coaches Nabin Kumar Shrestha and Govind Sharma. The association will also conduct similar events in Jhapa, Butwal, Nepalgunj and Mahendranagar.