Family theatre show The Lone Pine Club is at Sheffield Park in Uckfield until Sunday, August 2.
The play is written by Alice Birch, adapted from a book series by Malcolm Saville and directed by Elizabeth Freestone.
The Lone Pine Club, presented by the award-winning theatre company Pentabus, is a new play for kids aged 7-12 and their families.
It follows a group of children who have a series of riotous adventures in the countryside.
The artistic director of Pentabus, Elizabeth Freestone, was born and brought up in Sussex. She studied Drama at Central Sussex College, worked with West Sussex Youth Theatre and then went on to a freelance theatre directing career working for companies like the National Theatre and the RSC.
Elizabeth became artistic director of Pentabus in 2012.
This production is based on The Lone Pine Club, a series of 20 books written between 1943 and 1975, following a group of children and their adventures.
Similar to Swallows and Amazons in feel, the central characters are David, Dickie, Mary and a girl called Peter.
They form a secret club and aim to be the very best explorers they can be.
The cast is: Ed Hartland (The Importance of Being Earnest, St James Theatre) as David, Katherine Carlton (Much Ado About Nothing, Old Vic) as Mary, Tom Cawte (Waiting For Godot, Cockpit) as Dickie and Anya Collyer making her professional debut as Peter.
Alice Birch is an award winning playwright whose credits include Revolt at the Royal Shakespeare Company, Little Light at Theatre 503 and We Want You To Watch at the National Theatre.
Ben Glasstone is the composer, and Stuart Angell, fresh from working on War Horse, will be working with Elizabeth Freestone once again as movement director.
Katie Lias (Lyric Hammersmith, Polka Theatre) is the designer.
People can book tickets from the National Trust Box Office on 0844 249 1895.
The show starts at 12pm with 3pm performances on Saturday and Sunday.
Tickets cost £15 for adults and £7.50 for children.
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