Campaigners have called for the stands at the John Smith’s Stadium to be opened up for a crucial ‘Save A&E’ meeting.
Health bosses are hosting a public meeting at the stadium about their controversial hospital shake-up plan.
The event is scheduled for a conference room that can hold about 400 people.
But ‘Hands Off HRI’ campaigners have arranged for 10,000 leaflets to be printed about the meeting and are considering arranging coaches to help boost attendance.
It is thought hundreds or thousands of people could be left out in the cold.
Chairman of the Save A&E campaign, Karl Deitch , said: “We’re hoping about 5,000 will come down but that could easily spiral upwards.
“We are getting leaflets printed which we will be delivering to shops and houses to target people who don’t use the internet and don’t know about the plan.
“By the time we are done, everyone in Huddersfield will be aware of the plans. We will try and fill the stadium!”
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His call comes after dozens of people were forced to wait outside a hotel at a meeting in February.
Support for the campaign to stop the changes has grown hugely since then and an estimated 10,000 people took to the streets of Huddersfield town centre to protest at the plan last month.
Clr Cooper said: “The Calderdale and Huddersfield CCGs have completely misjudged the concerns of local people so far.
“At the pre-consultation event at Briar Court Hotel, the hall could have been filled twice over.
“That should not happen again.
“There is a lot of interest in the public meeting at the John Smiths Stadium on Monday April 18 and they should be planning for a big crowd.
“I don’t believe we are just talking about a few hundred people attending.
“I think we are most likely talking thousands.
“If they hold another event where people are left outside an unable to participate it is further evidence that they are out of touch with public opinion.
“There should at the very least be a contingency plan to make the stadium stands available for the event.
“This holds 24,500 people and should be adequate!”
Mr Deitch said the campaign group would encourage people to attend even if they had to stand outside.
“People must be aware that they might be left standing in the car park singing,” he said.
“But as long as people are there to make noise it will be great.
“It’s about making ourselves heard loud and clear that we absolutely oppose the plans.”
A spokesperson for the NHS bosses behind the ‘Right Care, Right Time, Right Place’ (RCRTRP) scheme, said they were still considering where to hold the meeting on Monday, April 18 from 6pm to 8pm.
The meeting will be independently chaired and is set to feature a question and answer session with clinicians and health managers behind the plan.
The RCRTRP website currently says the meeting will be in a conference room, adding “Whilst this is a large venue, we suggest you arrive on time to ensure chance of seating.”