As many as 10,000 people are expected to line Waterford's quayside this weekend to celebrate the city's 1,100th birthday, organisers say.
The highlight of the outdoor spectacle on Saturday will be a dramatic recreation of the Viking arrival at the south eastern port in 914AD.
Final preparations are ongoing for the production called Vadrarfjordr! - the Viking name for the settlement - which has been two months in the making.
A 30-strong cast directed by street art organisation Spraoi, which is based in the city, will re-enact the landing of the Vikings with original music and spoken word narrating the story.
The centrepiece of the show will see three stylised Viking ships set onto Waterford's Lower Quay.
"We've incorporated recordings of instruments from the era, so the soundscape has an authentic historic echo," said Mike Leahy, artistic director for Spraoi.
The family-friendly free event will also include pyrotechnics, a light display and other special effects, organisers said.