Two matches of the 2019 Vitality Blast will be played on the 27th. Durham will host Birmingham Bears at Chester-le-Street, while Surrey will host Somerset at The Oval.
August 15 will feature three matches at the 2019 Vitality Blast – at Riverside Ground, The Oval, and Derby.
Six matches will be played on August 11, at Chester-le-Street, Edgbaston, New Road, Cardiff, Radlett, and Headingley.
There will be plenty of changes in both the North and South groups tables on a day filled with T20 action.
August 7 will see four clashes of Vitality Blast 2019
Worcestershire will hope to keep pressure in pursuit of the top spot while Leicestershire looks to move out of the bottom.
Sunday will feature three Vitality matches: Derbyshire Falcons vs Lancashire Lightning, Northamptonshire Steelbacks vs Yorkshire Vikings, and Worcestershire Rapids vs Durham Jets.
Lancashire, Warwickshire, and Hampshire will host Durham, Leicestershire, and Kent respectively.
The second day of Vitality Blast 2019 will see Glamorgan and Worcestershire Rapids playing their second encounters respectively against Gloucestershire and Birmingham Bears. The third fixture of the day will be played between Durham Jets and Northamptonshire.
Cameron Bancroft will lead Durham, Ireland will host West Indies and Bangladesh, and Williamson won the Sir Richard Hadlee Medal.