Tuesday Jan 25 SHARES in clothing retailer and manufacturer Theme International begin trading on the Hong Kong stock exchange following its initial public offer. A Legislative Council sub-committee meets to discuss the financing of the Chek Lap Kok airport project. Government Director of Environmental Protection Stuart Reed holds a year-end news conference. Aetna International holds a news meeting to announce details of its ''Asian Business Responds to AIDS'' conference to be held in April 1994. Wednesday Jan 26 A CONFERENCE about investing in China's power industry begins, organised by the Institute for International Research (lasts until January 27). Pepsi-Cola International holds a news conference to announce what it describes as ''far-reaching plans for expansion and development in China''. The Bank of New York holds a news conference on the trends in the market for depositary receipts. Joseph Velli, executive vice-president in charge of the bank's securities services, will attend. Thursday Jan 27 SHARES in audio products equipment supplier Albatronics (Far East) begin trading following its initial public share offer. Chief executive of the Hong Kong Monetary Authority Joseph Yam speaks at a luncheon meeting of the French Business Association. Government Director-General of Industry Denise Yue speaks at a Hong Kong General Chamber of Commerce luncheon. Financial Secretary Hamish Macleod presents the Hong Kong Fund Manager of the Year Awards. Friday Jan 28 THE Government releases provisional December merchandise trade figures. US Trade Development Agency regional director Frederick Eberhart and deputy regional director Rebecca Repes speak at an American Chamber of Commerce breakfast. on how to use the TDA to win contracts. Hong Kong International Terminals managing director John Meredith speaks at an American Chamber of Commerce luncheon on the development of ports in the Pearl River estuary. Monday January 31 HONG Kong's third English-language newspaper Eastern Express is scheduled to be launched by the Oriental Press Group. Tuesday February 1 SHARES in printed circuit board and laminates maker Nam Hing Holdings begin trading following its initial public offer.