The eponymous event, Flackstock, will aim to raise money for various mental health organisations.
Organisers said that the four “worthy outlets held a special place in Caroline’s heart”.
What is Flackstock Festival?
Organised by the late star’s mother Christine Flack and close friend Natalie Pinkham, the festival is being held in Caroline’s memory.
Mrs Flack said: “My Caroline was never more herself or happier than at a music festival with her sister and her friends.
“Flackstock is the wonderful idea of those who knew her best and the perfect way to remember her singing, dancing and most of all laughing.”
She added: “Not only is Flackstock the most positive way to honour Carrie, but charities that she loved will benefit from the proceeds.
“A big thank you to everyone involved for all their hard work – to Natalie for the mad idea, Giles Cooper Entertainment and Englefield House who saved the day, Live Nation and to all the brilliant sponsors.
“My family are so proud that so many people who knew Carrie loved her so very much.”
Following the summer concerts part of Heritage Live, Giles Cooper Entertainment have provided team members and support for free to help organise the event.
When and where is Flackstock?
The festival will take place on Monday, July 25.
Gates will open at 4pm on the grounds of Englefield House in Pangbourne, Berkshire.
The celebrity line-up includes musical performances from Louise Redknapp, Masked Singer winner Natalie Imbruglia, Pixie Lott, and Fleur East.
Strictly Come Dancing couple Janette Manrara and Alijaz Skorjanec will join the festival celebrating Flack, who won the twelfth series of the show in 2014 with professional partner Pasha Kovalev.
Although more acts are still to be announced, some star appearances include Professor Green, Dermot O’Leary, Kirsty Gallacher, Paddy McGuiness, Joel Dommett, Noel Fielding, Keith Lemon and June Sarpong.
Ticketmaster is offering adult admission for those 15 years old and over priced at £50.64, while younger guests aged 6-14 years old can buy tickets for £28.15.
Accessible tickets include a free seat for accompanying carers, sold at £35.
For VIP access to an exclusive bar and toilets, VIP tickets are available at £95.65.