And that has shaken up many people who are planning to go.
According to published reports the band cancelled because of some controversy surrounding front man Dave Grohl.
Replacing them will be Jack White and Greta Van Fleet.
Both additions play on Sunday.
Music fans News 12 talked to say they are crushed after hearing the Foo Fighters aren't showing.
"I feel like I was devastated, I was very looking forward to go," said Christian Romero from Norwalk
"I think they did a good job getting replacements in, but they're not in line with the kind of music I was here to see, and no disrespect to them they're great, but not who I want to see. I want the Foo Fighters," said Chris Papallo from Stamford.
Fans tell News 12 the company should give them the option to be reimbursed.