There will have been no shortage of drinking games played by thirsty fans by the time the weekend is out.
But one of the safer and saner options at the Sevens is the Guinness version, which basically means you can drink the official beer for free.
All you have to do is name the first try-scorer in each game - after it has been scored!
'As Guinness is celebrating their 250th anniversary and our second year as the official beer of the Sevens, we have this special treat for rugby fans, says Guinness senior marketing manager Eva Yim (pictured).
'We're encouraging Sevens fans to SMS in the name of the first try-scorer in each game [after the try is scored] and at the end of every game, a lucky draw winner will get a text back to say they can redeem four pints of Guinness at the bar. All very easy and it's good fun, given it is on offer for every game.'
And it's not just free beer the game offers. Tonight, all entries will go into a lucky draw to win an all-expenses trip on the Lions tour to South Africa in June.
Guinness's links to the Sevens only go back to last year, but its heritage in Ireland dates back to 1759.
'What I like about this is it's a truly international event where people gather from around the world to enjoy Hong Kong and the rugby,' Yim says.
'You could say Guinness' brand values of goodness, communion and power also apply to the Hong Kong Sevens.'