The former leader of a pro-democracy group in Hong Kong known for its annual vigil commemorating the 1989 Tiananmen Square crackdown won an appeal against her conviction and sentence over her role in last year's banned event on Wednesday.Tonyee Chow, the former vice chairwoman of the now-defunct Hong Kong Alliance in Support of Patriotic Democratic Movements of China, was given a 15-month sentence in January after being convicted of inciting others to take part in the unauthorized assembly.But the Hong Kong High Court overturned the sentence, saying while Chow called for the public to assemble at Victoria Park it was not considered illegal as the legality of the ban could not be established.The vigil has been banned by police for three consecutive years on public health grounds amid the coronavirus pandemic, with officials warning that participating in or promoting the rally is illegal.Chow has been remanded in custody after being arrested in September last year and charged with incitement to subversion in a national security case involving the group."