Mardi Gras Apologises After Thousands Of Enraged Ticket-Holders Locked Out Of After Party

Sydney Gay and Lesbian Mardi Gras has been slammed by thousands of angry ticket-holders who were locked out of the official after party on Saturday night.

Organisers were forced to issue an apology after the venue reached full capacity, causing thousands to miss headline acts and queue for hours.

More than 10,000 people purchased tickets to the after party that was headlined by major international acts Sam Smith, Dua Lipa and Kesha.

Sam Smith and Dua Lipa headlined the after party. Image: AAP

Organisers struggled to find room for party-goers inside the venue that could only accommodate 5,500 people after the Royal Hall of Industries was unavailable for use.

10 daily understands there were four designated areas with televisions installed so party-goers could watch the headline acts if they couldn't get inside the Hordern Pavillion itself.

But tickets to the official after party didn't come cheap -- costing punters up to $270 a person.

Some punters said they'd missed out on the party after flying from the United States and the UK to attend.

Frustrated revelers took to social media to slam the organisation and demand a refund.

One person claimed it was "the worst party in memory" after crowds were stranded outside in a non-moving line that snaked around the venue.

The official after party is the biggest LGBTQI party in the Southern Hemisphere. Image: Sydney Mardi Gras

Another person called it a "disappointment" after they'd flown from the United States and paid over $300 to attend only to be stuck outside all night.

"What a sh*tshow, you took one of the best parties in the world and replaced it with hours of queues," another angry punter wrote.

Sydney Gay and Lesbian Mardi Gras apologised to ticket-holders on their website, but did not comment on whether it'd be providing them with a refund.

"We are deeply disappointed and apologise that this has occurred," organisers wrote in a statement on Sunday.

"It’s no secret that this year we lost the Royal Hall of Industries as a venue for the annual Mardi Gras Party."

"We recognise significant changes are required for the smaller party footprint to be successful. We’ve received some valuable feedback this year, which will help us continue to develop and evolve the Party experience."

Sydney Gay and Lesbian Mardi Gras is expected to provide an update of the action it will take later on Monday, 10 daily understands.

10 daily has reached out to Sydney Mardi Gras organisers for comment.

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Feature Image: Twitter