A SEVEN-METRE tall Chinese Lantern, together with 200 other exquisite lanterns, will light up Ko Shan Road Park on on Saturday to celebrate the Spring Lantern Festival - Valentine's Day on the Chinese Calendar. The evening begins at 6 pm with a series of entertaining programmes, including the Chinese Classical Acrobatic Performance, an all-star show in the Ko Shan Theatre, karaoke in the mini-soccer pitch, as well as a lantern gala. Admission from 6 pm to 10.30 pm is free and no tickets are required, with the exception of the all-star show. Free admission tickets for the ''All Star Show'' are available on a first-come-first-served basis at all district offices, enquiry counters at the Hongkong Cultural Centre and City Hall; and the Urban Council's Entertainment Office in Queen Elizabeth Stadium. For details, call 591-1383.