HONG KONG: Tens of thousands of people from Hong Kong offered happy birthday greetings yesterday, joining a parade of dragon dancers and a marching symphony orchestra, as the city marked the 12th anniversary of its return to the motherland.The parade kicked off after the Chinese national flag and the flag of the special administrative region (SAR) were raised at a morning ceremony attended by government officials and hundreds of local residents and tourists at Golden Bauhinia Square in Wan Chai.