Castell Henllys Iron Age Village, near Crymych, needs people to support the prehistoric site, which is owned and run by the Pembrokeshire Coast National Park Authority.
It would involve practical tasks such as maintaining the herb garden and supporting events.
An open afternoon for those interested was held on Saturday afternoon.

Orla Galton, from Blackmill, Bridgend county, was diagnosed with leukaemia at three and blood transfusions helped save her life.
She endured them for years, but her mother, Sharon, said they were a lifeline.
The Welsh Blood Service wants 200,000 more donors to replenish stocks.
"When Orla was having chemotherapy her bloods hit so low that she became anaemic, she would have no white blood cells so she couldn't fight any infection," she said told BBC Radio Wales.
"It's quite a dangerous time as while their bloods are going down, they can't carry on with the treatment. Orla needed blood transfusions so she could keep having the chemotherapy."
Orla, who has now been given the all clear, paid tribute to the donors who helped her.
"I would just like to say thank you," she said.
"I can't thank you more."
The Welsh Blood Service said:

The archive of travel writer, war hero and adventurer Sir Patrick Leigh Fermor has been catalogued by the National Library of Scotland.
The collection includes letters from Prince Charles and Truman Capote.
Sir Patrick, who was known as Paddy, died in 2011 at the age of 96.
He published several books on his travels around the world and one of the most prized items in the archive is the only surviving notebook from his 1933 trek across Europe.
The trek provided the material for his most famous books, 'A Time of Gifts', 'Between the Woods and the Water' and 'The Broken Road'.
Thousands of items which occupy 16 metres of shelving took a year to be catalogued by library staff.
Along with letters from notable 20th century figures they also uncovered literary manuscripts, sketches and what appears to be an unpublished John Betjeman poem on the back of an envelope.
Sir Patrick spent much of World War Two on Nazi-occupied Crete. During his time there he disguised himself as a shepherd to organise guerrilla operations against the Nazis. He led one of the most daring feats of the war in 1944, capturing the commander of the German garrison on Crete.
The 1957 film starring Dirk Bogarde 'Ill Met by Moonlight' was based on the operation.
Graham Stewart, the library curator who worked on the archive project, said: "It is a history of the colourful life of a celebrated writer. He was undoubtedly a superstar of his day and his books have, if anything, grown in popularity over the years.
"There has already been a lot of interest in the archive and we expect this to increase now among Leigh Fermor fans and people interested in the 20th century more generally."
The library is working on digitising some of the archive so it can be viewed on its website. They are also considering holding exhibitions and displays of the collection so more people will be able to see it.
The archive was given to the library by the John R Murray Charitable Trust. John Murray was Sir Patrick's publisher and the trust also supported the cataloguing of the collection.

Isis Academy in Oxford said it had rebranded as "Iffley Academy" to protect its "reputation, integrity and image".
The name 'Isis' was originally chosen as the school is near to the section of the River Thames of the same name.
Formerly Iffley Mead School, it became Isis Academy in 2013.
A statement issued by the school said it had changed name following "the unforeseen rise of ISIS (also known as ISIL and the Islamic State) and related global media coverage of the activities of the group".
"Our priority is to remove the detrimental impact which the name 'Isis' had on pupils, their families and our staff."
Last year a language school in the city removed Isis from its name for the same reason.
The Isis is the name given to the part of the River Thames above Iffley Lock in Oxford. It is also the name of the goddess wife of the god Osiris in Egyptian beliefs.
Volunteers are being sought to help look after a heritage site in Pembrokeshire.
[NEXT_CONCEPT]
A 12-year-old cancer survivor has urged more people to give blood, as the number of new donors has dropped by 40% over the past decade.
[NEXT_CONCEPT]
A lifetime of diaries, letters and photographs of a man described as a cross between Indiana Jones, James Bond and Graham Greene has opened to the public.
[NEXT_CONCEPT]
A school has changed its name from "Isis" because the word has become associated with the so-called Islamic State.