AN action group fighting plans for a multi-million-pound business park expects up to 400 people at a public meeting.
Campaigners have set March 14 as the date for their protest in Mirfield.
Action group secretary Amelia Bolton said: "We have been overwhelmed by public support. We have struggled to find a venue big enough for the number of people who said they wanted to be there."
Agents for the 30-acre Mirfield 25 development off Slipper Lane and Leeds Road, say it will bring 1,000 jobs to the town.
Their plan includes offices and manufacturing space, a pub, a hotel and a car showroom.
But campaigners fear the development will cause traffic chaos and say green fields should not be lost when there are brownfield sites available.
Ms Bolton said: "This development is not wanted by the vast majority of Mirfield people. If it is allowed to go ahead it will have a devastating impact on the town."
She said Naeem Siraj, from Huddersfield law firm Chadwick Lawrence, had offered legal advice as the group plot the next stage of their campaign.
An outline planning application for the site - which was allocated for industrial use in 1998 - has been submitted to Kirklees Council.
The public meeting is at Christ the King Church on Stocksbank Road, Battyeford, starting at 7.30pm.
Ms Bolton added: "The purpose will be to inform people of what is being planned and let them know how they can make their objections known.
"We would urge anyone who cares about Mirfield and its future to put this date in their diary and attend the meeting.
"It is vital the town presents a united front. This development is unnecessary and unwanted."