Lunar New Year
The Lunar New Year is a 15 day festival beginning with the first new moon between the 21st of January and the 20th of February.
One of the most popular events during the new year celebrations in Hong Kong is the New Year Parade where you can see things from lung dragons to traditional Chinese dancers. The parade starts at 8pm and goes from Nathan Road to Salisbury Road to Canton Road and finally to Haiphong Road.
Unique to Hong Kong new years celebrations is horse racing. The Sha Tin Racecourse is usually filled with around one hundred thousand spectators during these events. The Hong Kong Jockey Club also organises a program of cultural festivities and entertainment.
The Spring Lantern Festival marks the end of the Lunar New Year. The whole city is decorated with colourful lanterns and a carnival is held at the Hong Kong Cultural Centre Piazza where you can see impressive lantern displays as well as other performances like dancing and acrobatics.

(Michael Elleray from England, United Kingdom, CC BY 2.0, via Wikimedia Commons)