Also on the bill for that night is a country band put together for the occasion.
It includes musicians well known to the Savage Club stage - John Keating, Fred Frederikse and Bungy Anderson.
The Wanganui Ukelele Orchestra will also entertain, along with others who put their names up on a whiteboard.
But back to Borwick and Bowness, who both play instruments some have loved to hate.
Apparently, he keeps the rhythm going on a four-stringed Irish tenor banjo, while she plays melodies on a five-stringed banjo.
In concert they play both traditional pieces and original compositions they hope will show the banjo "in a new, graceful light".
Both young musicians have a long list of accomplishments.
Borwick has played jazz trombone for artists such as Rodger Fox.
Since taking up the Irish tenor banjo in 2007, he's immersed himself in Celtic music and is a member of the folk trio Forbidden Joe.
But he can equally easily pick up another instrument and segue into reggae.
At 20 years old, Bowness is the only person who has ever done a three-year degree in jazz banjo at the New Zealand School of Music.
In 2007 she was invited to the United States to tour with bluegrass band Long Road Home and the young Australasian trio Twisted Oak.
The two have spent the past 18 months on a musical exploration of everything from Bach to Queen.
They've even ventured off into Balkan and tango.
They have been guests at several New Zealand folk festivals and have released an EP called Play Banjo.
