Rotorua Museum is inviting people to dress up as their favourite bug, bird or scientist and be in to win spot prizes.
The bug day out has been organised to raise awareness of the plight of native falcons and to show how their eco-system works, said Jo Doherty, Rotorua Museum spokeswoman.
"If you don't have bugs, you don't have small birds and if you don't have them, you don't have falcons," she said.
People are also encouraged to bring along a critter from the backyard and show them to "Bug Man" Ruud Kleinpaste.
Wingspan director Debbie Stewart will bring an endangered karearea (New Zealand falcon) and give a talk about the native birds.