As with the Northampton launch event, more than 80 Under-13s participated in the tournament's second leg with The Perse School securing an impressive final triumph over Swavesey Village College.
Both teams advance to finals day at the home of the Saints on April 25th, joining Northampton School for Boys and Winchester House as the qualifying period hits the halfway mark.
Peter Anderson, The Perse Under-13 rugby coach, was delighted with the day's action and said the tournament provided plenty of motivation for the youngsters.
"Despite the freezing cold it's been excellent," he commented. "There's been some good rugby played and it was good for the lads to get a run out for the first time in a little while.
"To have the incentive of playing finals day at Franklin's Gardens was a big message for us all week in the lead up to the tournament and we are looking forward to being there in a couple of weeks."
Saints' own Mike Haywood and Ben Nutley were on hand to present the winning schools with their medals and trophies and, having played Sevens rugby for the Saints, Nutley praised the Elite Insurance 7s Series setup.
"I love playing a bit of sevens and it's the perfect game to get youngsters into the game of rugby," he said. "I've seen a few nifty players out there and you never know, you might spot a rare talent out there!"
The Elite Insurance 7s Series continues next Tuesday at Bedford Athletic RFC, when Martin Roberts and Paul Diggin will cast an eye over the sides bidding to qualify as Bedfordshire representatives.
CAMBRIDGESHIRE ELITE INSURANCE 7s SERIES
WINNERS - THE PERSE SCHOOL
RUNNERS UP - SWAVESEY VILLAGE COLLEGE