The seaside town of Abersoch in Gwynedd plays host to Duffy's Welsh homecoming gig at Wakestock this weekend.
It's the ninth year of Wakestock and big names are promised to top the bill at the festival on the Llyn Peninsula.
As well as the Nefyn singer, DJ Mark Ronson, Groove Armada, the Streets and the Happy Mondays are booked to appear.
The festival, expected to attract thousands of fans, is also a draw for 'wakeboarders' where fans ride a water
ski, which is like a surfboard.
Duffy, one of 2008's biggest-selling artists, will perform during the festival along with Zane Lowe, The Hoosiers, Audio Bullys, Mystery Jets and Plump DJs.
She has recently performed to huge crowds at Glastonbury.
Around 70 acts - ranging from dance to indie and Welsh-language bands - are expected to wow the crowds.
And BBC Radio 1 DJ's Jo Whiley will also be there at the festival, which boasts three stages.
The festival site is based at Penrhos and overlooks Cardigan Bay and the Snowdonia mountains.
Last year bad weather caused the event to be partly cancelled on the Saturday night.
But BBC Wales weather forecaster Derek Brockway said the outlook for Abersoch looks unsettled and could be showery with longer spells of rain.
"It looks like it's not a total wash-out but not what you expect in July," he said.