The challenge is on to raise over £20,000 at this year's Chevron Charity Weekend, which it has been announced will be held on Friday and Saturday, June 17 and 18 at Folly Farm.
Last year's event raised over £17,000 and Chevron, who organise the event in association with Folly Farm, are looking to beat that previous record.
"We're hoping to get over the £20,000 this year, which is a huge ask but I believe the people of Pembrokeshire are up to it," said Phil Thompson, Chevron's public affairs manager.
"That'll Be The Day proved hugely popular last year. They were a sellout on Saturday night and a near sellout on Friday. This year, we want sellouts on both nights," added Phil.
After last year's success, That'll Be The Day will once again be performing hits from the 1950s through to the 1980s, which last year included favourites such as Queen's We Are The Champions and Satisfaction by the Rolling Stones.
One hundred per cent of the money raised from ticket sales over the two nights will be split between Wales Air Ambulance and the RNLI.
Doors will open at 6.30 pm with That'll Be The Day on stage at 7.30 pm. Everyone who attends will receive a free souvenir programme. For further details or to book, 'phone (01834) 812731.