About 20,000 people are expected to attend a candlelight vigil tonight to mourn the death of deposed Communist Party general secretary Zhao Ziyang , according to organisers' estimates. The one-hour vigil, organised by the Hong Kong Alliance in Support of Patriotic Democratic Movements in China, starts at 8pm in Victoria Park. Alliance vice-chairman Lee Cheuk-yan said the group informed police on Wednesday of its estimate that between 5,000 and 20,000 people would attend the vigil. Cheung Man-kwong, a member of the alliance's standing committee, said the group had changed the venue for the event, which originally was planned for the southern pavilion in the park, to the soccer pitches. The move was made when the alliance realised more people would attend than originally estimated. Mr Cheung said the controversy over the silent tribute at the Legislative Council meeting on Wednesday had raised interest in the community about Zhao's death. 'We believe that more people are likely to attend the vigil because of the controversy on Wednesday,' he said. Mr Lee said the Leisure and Cultural Services Department had reserved three soccer pitches in Victoria Park for the vigil, to be held under the theme of 'vindicating June 4 and mourning Zhao Ziyang'. Another three would be ready if the turnout was high. Memorial speeches by pro-democracy activists on the mainland and abroad would be read during the vigil. Mr Cheung said the organisers would call on those taking part to sing songs commemorating the pro-democracy movement in 1989 and chant slogans such as 'vindicating June 4'.