Veteran Big Gay Out attendee Prime Minister Jacinda Ardern said the day was a chance to celebrate but also a "reminder" of the work to be done for the rainbow community.
Ardern, who has been attending the Ending HIV event at Auckland's Coyle Park for many years, was visiting for the first time as Prime Minister.
"I've lost count of the amount of times I've felt proud to stand on this stage," Ardern said in a speech on the main stage to a cheering audience.
Coming back for the 20th anniversary event as Prime Minister was "very special".
"It is one of many events that shows the incredible diversity of New Zealand, and that is something to be celebrated."