Riverside Ground, Chester-le-Street will host the first quarterfinal, between Lancashire Lightning and Essex Eagles on September 4.
Lancashire Lightning will play Essex Eagles in the first quarterfinal on September 4, at Riverside Ground, Chester-le-Street.
The table-toppers of both North and South groups are involved on another day of T20 Blast action.
There will be plenty of changes in both the North and South groups tables on a day filled with T20 action.
August 14 will feature three Vitality Blast matches- Lancashire vs Northamptonshire, Essex vs Middlesex, and Kent vs Glamorgan.
Six matches will be played on August 11, at Chester-le-Street, Edgbaston, New Road, Cardiff, Radlett, and Headingley.
The top team of North Group will be fighting the fifth in the race on August 3.
Sunday will feature three Vitality matches: Derbyshire Falcons vs Lancashire Lightning, Northamptonshire Steelbacks vs Yorkshire Vikings, and Worcestershire Rapids vs Durham Jets.
On July 25, Gloucestershire, Surrey, and Yorkshire will host Middlesex, Glamorgan, and Lancashire respectively.
Lancashire, Warwickshire, and Hampshire will host Durham, Leicestershire, and Kent respectively.