Music fans will be treated to a host of Northern Ireland talent before the show finishes with Snow Patrol.
It marks the hat-trick for the band after their massive gigs there in 2007 and 2010.
The one-day event will also feature acts such as Two Door Cinema Club, Foy Vance, Ash and many more.
There will also be a second stage showcasing the future of the Northern Ireland music scene.
The gates will open at 2pm and Translink will be running special return train and coach services for the event.
Special late night shuttle train services will run from Bangor Station to Belfast Lanyon Place, from approximately 10.45pm-11.45pm.
The special shuttle return ticket can be bought from any main station today.
There will also be onward late special services in operation from Belfast Lanyon Place.
Full travel details are available at www.translink.co.uk/wardpark3.
There are also a number of restrictions on what you can bring to the event.
Among the items not permitted are alcohol, drinks (excluding less than 500ml sealed water), umbrellas and fold-up or blow-up chairs. Those attending are also urged to only bring a small bag - as no backpacks or large handbags will be allowed.
Speaking to the Belfast Telegraph last month, Gary said that it will be an emotional gig for himself and the rest of the band.
"We wanted to make this one doubly-special by making sure it was an all-Northern Irish affair with bands from all over Northern Ireland and celebrating our wee country at its finest.
"Our music scene is something we can all agree is something that is really, really exceptional in this country, along with a lot of other things culturally, and sport.
"We've always punched above our weight, but for Ward Park we wanted to make sure it celebrated the best of Northern Ireland."
The 42-year-old said: "I will try and save any tears until afterwards."
He added: "When music starts blaring out of the stage at Ward Park for the first time in nine years, that will be something very special."