Ollie Thorley scored four first-half tries in Gloucester's win against Leicester, while two Exeter hat-tricks helped to crush Worcester.
A last-gasp try from Billy Keast gave Exeter Chiefs a dramatic late win over Bristol Bears.
There were comebacks for leaders Exeter Chiefs and Wasps in Friday's Premiership action.
Leaders Exeter Chiefs resumed the season with a win over Leicester Tigers, while Bristol left it late to down Saracens.
The Professional Game Board said more work needs to be done before Premiership rugby teams in England can start training.
England international Harry Williams says he feels ready to move to another level after extending his stay with Exeter Chiefs.
A five-week break has been implemented in the Premiership, with the Champions Cup and Challenge Cup quarter-finals pushed back.
Exeter Chiefs have returned to the Premiership summit, while Wasps and Saracens also celebrated victories.
Exeter plundered eight tries in a crushing victory over Northampton as they took another step closer to finishing top of the Premiership.
Stuart Hogg was among the scorers on his Exeter Chiefs return as Gloucester were beaten at home.