AFTER a cold, rainy Saturday, a fine Sunday was said to be especially prepared for the colourful carnival held by the Committee on Home-School Co-operation at the Sha Tin Central Park recently. ''Before a Parent-Teachers Association is formed, each group may blame the other for not taking full responsibility for educating the children,'' said Mr Tik Chi-yuen, Chairman of the Committee on Home-School Co-operation in opening the event. ''The Committee was formed to try to bridge the gap through different activities.'' ''We will soon co-operate with the University of Hong Kong and the Hong Kong Polytechnic to carry out two large-scale research projects. One concentrates on how well the two sides are co-operating and their expectations; while the other wants to find outthe parents' view on different aspects of school life,'' he explained. ''I think the setting up of Parent-Teachers Association is a good way for we parents to communicate with teachers so as to give our children the best education possible,'' said Mr W. S. Yeung, a committee member of the Parent-Teachers Association of Belilios Public School. Twenty game stalls were set up at the carnival by the students, parents and teachers of 20 primary, secondary, special education and technical schools. Long lines of families keen to play the games soon formed. ''I am very happy, feeling that I have helped to offer the children a pleasant afternoon, '' said Isabella Chan Siu-ling, a Form Six student helper at one of the game stalls. A highlight of the carnival was a variety show put on by students from 10 of the participating schools. The programme included a lion dance, Chinese Orchestra performance, folk dances and Christmas carol singing. Prizes were presented to the winners of the photography and logo design competitions held previously with the same theme of the Carnival. All the winning projects were displayed. Ngan Sau-wai distinguished herself from the other logo design entries with her design which placed a happy family within a picture of a pencil. The design used a bright yellow colour. ''Yellow represents brightness and happiness; while a family picture within the pencil represents harmony among parents and teachers,'' she said.