Harland and Wolff is expected to be placed into administration today, putting over 100 jobs at risk.
In its heyday, the shipyard employed more than 30,000 people.
Famously known as the builder of the Titanic, the yellow cranes are an iconic symbol in Belfast.
The firm had been up for sale due to financial issues with its Norwegian owner.
Protests have been on-going around the clock in a bid to save the yard.
A family fun day was held on Sunday to thank those who have supported the campaign to keep the yard open. There was face painting and bouncy castles and workers were joined by their families.
Shipyard workers joined with Irish language group An Dream Dearg for a bi-lingual protest last week.
They have called on prime minister Boris Johnson to re-nationalise the H&W yard.
Although shipbuilding stopped in 2003, the company served as a structural engineering firm for the offshore energy sector.
Fred Olsen, the Norwegian businessman who bought H&W in 1989, put the business up for sale at the end of 2018, renewing fears for the future of the yard.
However, the nearby Titanic Belfast visitor centre, which opened in 2012 and which markets the shipbuilding story, saw 840,000 people through its doors in 2018.
@Tim_Mc_Garry the brilliant, generous and hilarious Tim McGarry flipping burgers at the Harland & wolff occupation family day! @UniteunionNI #SaveOurShipyard #ReNationaliseNow pic.twitter.com/evnNbeOu0C
— Susan Fitzgerald (@1977susan) August 4, 2019
Full support & solidarity from @IndustriALL_GU with our affiliates @unitetheunion and @GMB members in Belfast, Northern Ireland to save workers jobs in the Harland & Wolff shipyard. Unions are demanding the UK government for the company to be nationalised #SaveOurShipyard
— Valter Sanches (@ValterSanches) August 5, 2019
That’s the Pride flag up at the Harland & Wolff occupation – workers united will never be defeated pic.twitter.com/UspWOtUMZv
— Susan Fitzgerald (@1977susan) August 2, 2019