The footpath between the Market Square and Sheep Street was the setting of FAMfest on Saturday (March 30) - the culmination of months of work by community group NorFAMton to renovate the underpass and make a new home for street art and town centre events.
The street food festival is a celebration after months of work to renovate the underpass.
The underpass came alive with music, food and dance.
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The underpass' grassy verge - dubbed 'Chill Out Hill' - became a great spot to soak up some sun.
The festival on Saturday (March 30) was open to the public for free for six hours where Northampton's public could meet and relax.
Local DJs and artists kept the party alive, hosted by MC Quinton Green.
Organiser Shereen Ingram said: "It was a huge success. People came from all over Northamptonshire to get involved."
Shereen said: "It was just what we envisioned but we were blessed with the weather. It was a real community event."
Organiser Kate Stanton said: "It's been really hard work but it was all worth it. The town needs more community events like this."
Shereen said: "It was just so nice to see so many happy faces. Everyone was just so enthusiastic and having a good time."
Emporium Way has been transformed by NorFAMton in the town's hottest outdoor venue.
Kate said: "We need more events like this in Northampton. It's a shame when people can't enjoy the town and just think 'I wonder what's happening in Bristol or London'.
Performers included Vintly Underground, Aidy West, DJ Joe Good Cat Moan, MCuts and Level Records.
Shereen said: "People said it had great vibes and a great atmosphere. Great food, great music... everything really."
The project was supported by Northampton Borough Council, who reportedly hope to have other underpasses in the town transformed over the coming years.
Emporium Way, off Sheep Street and the Market Square, has been neglected since Greyfriars was knocked down.
Other acts included Elle Delaney, Har-Q, Lay It Down and Vicky Cox.
The event was supported by local traders, craft stalls and street food boxes.