Until 15 December tickets are on sale for the two days at Twickenham for just £10.
The London event at England's home of rugby is the penultimate in the IRB Sevens World Series and kicks off the European climax to the season, which culminates at Murrayfield on 30-31 May.
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Last season Samoa took the London title, beating Fiji in the final after battling past hosts England in the semis.
Early form this season hints that England may well challenge for the overall Series title.
South Africa pipped them to the Cup at the first tournament in Dubai but Ben Ryan's side looked fitter and slicker than at any time last season.
