The popular event in the Queenstown Memorial Hall aims to raise more than $10,000 to update the school's computers.
"The event is a great opportunity to purchase a great painting and support St Joseph's school and [enjoy] a fun evening," PTA spokeswoman Nicky Thompson said.
Landscapes, portraits, ceramics and sculptures - contributed from such artistic luminaries as Ivan Clarke, Hope Gibbons, Karen Scott, Simon Morrison-Deaker, Sue Wademan, Brian Millard and Nigel Wilson - will be on the auction block.
A public viewing will be held in the hall between 2pm and 4pm. Entry is by gold coin donation.
Drinks and canapes will be offered from 6pm and the auction starts at 7pm. Entry is $10.
The auction is expected to feature about 45 artworks and will be marshalled by licensed auctioneer Brendan Quill.
A silent auction was likely to feature about the same number of pieces, organisers said.
• To register for telephone bidding, contact Sonja Kooy on 027 210-2554.
