Doors for the Boston Calling Music Festival opened at 1 p.m. May 23, but Brian Scully didn’t know he was performing until he got the call at 10:30 that morning.

Suddenly, Scully and his band, Dalton and the Sheriffs, were set to hit the Green Stage as a last-minute replacement for 1990s girl group TLC.

Dalton and the Sheriffs is a five-piece country band consisting of several Massachusetts born and bred natives: lead vocalist and guitarist Scully, backup vocalist, guitarist and keyboardist Joey Pantaleo, bassist Dennis Walsh, guitarist Jay Tagg and drummer Dan Vassallo.

The band’s 11th-hour performance May 23 marked their first appearance at Boston Calling.

Having to perform one man down, as Tagg was on vacation in Las Vegas, the band quickly had to sort themselves out.

“Right when we got here, we were pretty much on the scene,” Walsh said. “It was that last minute.”

Luckily for the band, being long-time friends and Boston locals helped ensure their success.

While the band officially formed in 2012, the majority of its current members, who are friends of 20 years, joined later on.

“[We] eventually all joined this band just because we’re buddies, and that’s what the band was about,” Pantaleo said.

Scully attributes part of the band’s growing success to its current lineup.

“You can have unbelievably great days, and days that are sort of like, ‘What are we doing?’” Scully said. “We’re lucky that we have a lot more great days than the other way, but I think it helps that the quality of people in the band right now has never been higher.”

Being from the Northeast, the members of Dalton and the Sheriffs may not be the first people that come to mind when describing country music artists. However, sporting a Red Sox baseball cap, a T-shirt and blue jeans on the Green Stage, Scully and his bandmates brought a version of country that resonates with the local Boston community.

“The most country part of what we do is the stories that we tell,” Scully said. “We tell country stories, but I don’t think we ever shoot for genre. We play them like a band from Boston plays country … It’s the story that really drives the country [sound] for us.”

One such story the band tells is in “After the Parade,” which is about one of the band’s first gigs at the Lansdowne Pub — right outside Fenway Park.

Scully is also a Boston University alum, graduating  from the College of Communication in 2002. His friends used to make him play for tips on campus, which later funded meals at a Burger King located where the Center for Computing and Data Science now stands.

Scully’s BU roots and education still help him in his musical pursuits. The lessons he learned from his late professor, Christopher Cakebread, about sports marketing and development were “hugely influential on some of the grassroots” efforts for the band.

“It’s all stuff ‘Cake’ taught me,” he said. “He was such an inspirational guy, and it’s pretty amazing how much he impacted my life personally.”

Many of the band’s grassroots marketing efforts begin and end with their local community.

“We’re super lucky the people who support us, that have been with us since day one, make it so that we get to do things that other bands can’t do,” Scully said. “Them showing up and supporting us over the years is unbelievable.”

Being an independent band allots Dalton and the Sheriffs more flexibility to “build genuine relationships with people” that lasts, Scully said.

Despite being unrepresented, the band will be headlining a show at the Leader Bank Pavilion in September.

“We’re one of the only indie bands that gets to book a place of that size and play it without having representation,” Scully said. “So, we live this really cool, almost in a bubble, life.”

While the band books venues like the Leader Bank Pavilion, which has a capacity of 5,000 people, Dalton and the Sheriffs continue to play in pubs and backyard stages across the country. It’s in these locations where they build their loyal fanbase and community.

“Our shows became a hangout place,” Walsh said. “I’ve never been in a band like that, where everyone’s there all the time. They’re bringing their friends, and they want them to be at the party.”

Holly Gustavsen and Samantha Marshall contributed reporting.