"It is to help them feel welcome and having pride in their own bodies and choices."
Pupil Riley Davison chose to dress up in colourful butterfly wings, multi-coloured headbands and rainbow socks.
"I want to be supportive," Davison, 11, said.
Speaking about the fire earlier this week, Tauranga pride advocate Gordy Lockhart said, "The rainbow community has had a spear through its heart.
"That building is acceptance, it's being part of a community that perhaps you didn't have access to beyond these grounds," he said.
"So that somebody would come in and destroy that space is just absolutely gutting."