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Hong Kong provides the social showpiece of the HSBC Sevens World Series

The rugby tournament has been running for four decades

Fiji has won the title for the past two years

CNN  — 

The annual sporting jamboree is the highlight of the social calendar for rugby fans who flock to the Hong Kong Stadium in their thousands.

Fancy dress and beer-fueled boisterousness are the order of the day for many of the 40,000-strong crowd as a party atmosphere descends on the city for three days at the end of March.

On the pitch, 28 teams will battle it out in a total of 71 matches with defending champions Fiji looking to repeat their recent success at the Japan Sevens.

Read: How to survive the Hong Kong Sevens