Hong Kong’s three chief executive candidates will attend a debate hosted by a local teachers’ union in the run-up to the election for the city’s highest office . Former chief secretary Carrie Lam Cheng Yuet-ngor, former financial secretary John Tsang Chun-wah, and retired judge Woo Kwok-hing are confirmed to partake in the event on March 12, the Professional Teachers’ Union said in a notice on Friday night. The debate is to be held at a moot courtroom in Cheng Yu Tung Tower at the University of Hong Kong. It will be open to some 150 union members by advance registration, with some journalists invited. A draw will determine which members may attend. With more than 90,000 teachers, the union is the largest teachers’ organisation in the city with more. About 90 per cent of its members are education practitioners. On Sunday, think tank Path of Democracy will hold the first candidates’ debate of the chief executive campaign. Lam and Woo are set to attend that event. The chief executive election will take place on March 26.