Dylan Hartley, Lee Dickson, Stephen Myler and Courtney Lawes are the quartet added to an evening already packed with entertainment, turning out between 6-7pm before the competition kicks off at 7.15pm.
Dickson, Lawes and Myler were all part of the England squad that successfully toured Argentina in June, as Stuart Lancaster's side gained their first away series win against the Pumas in 32 years. The trio will be making their first public Saints appearances since the series - during which Myler won a long overdue first senior cap for his country.
The tournament itself will see the Saints take on their East Midlands rivals Leicester Tigers, Newcastle Falcons and Sale Sharks in an attempt to make it through to the JP Morgan 7s Series finals at Bath's Recreation Ground seven days later on Friday, August 9th.
Tickets are still available to buy online by clicking here with a whole host of entertainment available including the launch of a unique Saints sausage, a beer festival and other activities suitable for the whole family, incorporated within a fantastic evening of rugby!