Characters from Dylan Thomas' famous play for voices Under Milk Wood are taking to the streets of the town which inspired the work as part of centenary celebrations for the poet.
The event at Laugharne in Carmarthenshire is being staged over the weekend by National Theatre Wales.
Raw Material: Llareggub Revisited is said to be a re-imagining of the play.
The action will be filmed for inclusion in a new BBC Wales TV version of Under Milk Wood to be broadcast on Monday.
It is the latest in a series of innovative productions by National Theatre Wales, which previously staged a passion play on the streets of Port Talbot starring Michael Sheen.
The show inspired by Under Milk Wood will be performed on Saturday, Sunday and Monday at a range of indoor and outdoor locations in Laugharne, where Swansea-born Thomas spent the last years of his life and wrote much of the play.
Created by artist Marc Rees and writer Jon Tregenna - who lives in Laugharne - it will feature live actors and pre-recorded performances from some of Wales' best-known actors and singers.
The show takes the form of a tour of Laugharne for a 200-strong audience led by Charles Dale, best known as hospital porter Mac in the BBC TV drama series Casualty.
But the party is hijacked by actor Russell Gomer, who plays an eccentric character who claims to know the real story behind Under Milk Wood and diverts the tour to the town's dark underbelly.
Members of the local Laugharne Players drama group also appear throughout the town as characters from its past and present.
John McGrath, artistic director of National Theatre Wales, said: "It's been pretty moving to work on this production because of the close relationship between Dylan Thomas and the town.
"For local people to get involved in this re-imagining of Under Milk Wood has been really touching."
Tickets for all three performances have sold out but visitors to Laugharne will be able to see much of the action as it unfolds around the town between 11:00 and 13:45 BST on Saturday, Sunday and Monday.
Scenes from the weekend's performances will be included in a new TV adaptation of Under Milk Wood to be shown on BBC One Wales on Monday at 19:00 BST, featuring stars such as Sir Tom Jones, Sian Phillips and Michael Sheen.