A spokesman said a large number of entries had been received from all over the country for the nine overall categories.
Mrs Jackson said the process application to make the finalists was "huge".
It covered everything from health and safety aspects, the marketing side, who it attracted and the economic benefits created."
In the best established regional event category, the deco weekend is up against Auckland's Armageddon Expo, the Auckland Lantern Festival and the Wanganui Cemetery Circuit motorsport event.
In the Best New Zealand- owned major event, it joins the Dick Smith NRL Nines, the Contact Lake Taupo Cycle Challenge and the Tarawera Ultramarathon.
The winners will be announced at a special dinner as part of the New Zealand Association of Event Professionals annual conference on July 22.
Mrs Jackson will attend in her role as general manager of the trust as well as part of the speaking line-up.