Welsh metallers Bullet For My Valentine have also been added to the event as headliners.
Slam Dunk takes place in Temple Newsam park in Leeds on Saturday 25th May, and Hatfield Park the following day.
The bands join the likes of All Time Low, New Found Glory, NOFX and Saves The Day across the weekend.
The full list of new additions is:
Bullet For My Valentine
The Get Up Kids
Saves The Day
Tiny Moving Parts
Tickets are on sale now.
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They further hone their emotionally-tinged songwriting to depict the power of change.
They’ll join You Me At Six, Every Time I Die and Frank Iero at the Cheltenham fest.
The Baltimore hardcore band will play five shows, including a free appearance at London’s House of Vans.
The tracks are taken from this year’s excellent ‘Time & Space’ LP.