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.
There will be plenty of changes in both the North and South groups tables on a day filled with T20 action.
The London Derby – between Middlesex and Surrey at Lord's – will be the only match of the 2019 Vitality Blast to be played on August 8.
August 4 will feature four Vitality Blast matches, at New Road, Headingley, Bristol, and Richmond.
Steve Smith’s dream return to Test cricket, the doubts he suffered in the past, and the round-ups from other cricketing action elsewhere.
As Middlesex and Kent battle for the top spot, Glamorgan will hope to push themselves off the bottom of the table.
On July 25, Gloucestershire, Surrey, and Yorkshire will host Middlesex, Glamorgan, and Lancashire respectively.
Two fixtures of Vitality Blast 2019 on July 23 will see Leicestershire hosting Yorkshire and a clash between Middlesex and Surrey at The Oval, London.
Middlesex, Nottinghamshire, and Glamorgan will host Essex, Worcestershire, and Somerset respectively.