The unlicensed Citizens' Radio went on air again last night, urging Hongkongers to attend events next week to mark the anniversary of the June 4 crackdown. Speakers made the appeals despite facing lawsuits for conducting similar activities earlier. Seven broadcasters, including three legislators - Emily Lau Wai-hing, Lee Cheuk-yan and 'Long Hair' Leung Kwok-hung - took part in the programme in the pedestrian zone in Great George Street, Causeway Bay, from 7pm to 8pm. The talk show had the theme 'vindicate the 1989 democratic movement, commemorate the 19th anniversary of the June 4 incident'. They called on people to join the annual march on Sunday and the vigil next Wednesday. Szeto Wah, chairman of the Hong Kong Alliance in Support of Patriotic Democratic Movements in China, said this year's events would be linked to relief for victims of the Sichuan earthquake. 'The June 4 crackdown was a human-caused tragedy and the Sichuan quake was a natural disaster. But human-caused tragedy was also involved in the natural disaster ... It is meaningful to mourn those who died in the two incidents together,' Mr Szeto said, referring to the collapse of 7,000 schools in the quake believed to be result of poor construction. Mr Lee, vice-chairman of the alliance, said the number of participants at this year's vigil was especially important because it would be seen as an indicator of whether Hong Kong people were willing to fight for democracy, freedom and human rights in this year of the Beijing Olympics when an atmosphere of celebration was prevailing. Six of the seven speakers are facing charges for taking part in previous shows broadcast by the station, and these cases are still pending court rulings. The only speaker at last night's show not facing charges was Jo Lee Wai-yee, a member of the League of Social Democrats. The Office of the Telecommunications Authority said it had initiated an investigation into the suspected use of unlicensed radio transmitter equipment following an unlicensed radio transmission last night. A spokesman said: 'If there is sufficient evidence, those who are involved will be liable to prosecution.' Tsang Kin-shing, founder of Citizens' Radio who also appeared last night, said they were not afraid of further charges and would conduct live broadcasts on June 4 and July 1 to report on the Tiananmen incident memorial vigil and the annual march for democracy.