Bend concertgoers will hear new artists and see continued environmental efforts at Les Schwab Amphitheater in its 18th season.

Bend’s largest outdoor venue kicks off its summer concerts Sunday with two of modern Americana’s biggest names, Jason Isbell and The 400 Unit and Father John Misty, on a co-headlining bill that also features rising U.K. singer-songwriter Jade Bird. But before the summer concert season begins in earnest, it might be a good time for a refresher on the amphitheater’s security rules.

The amphitheater introduced new security measures in 2017 and 2018, including the use of metal-detecting wands in 2017 and a ban on personal blankets, mats and towels that went into effect last year. That said, the concert-going experience should remain relatively unchanged from last year, according to director Marney Smith.

While low-profile chairs are still allowed at most general-admission shows, including Sunday’s season-opener, the blanket ban will continue this year. People can borrow beach towels from the venue at the concierge tent. The ban was instated to speed up lines and allow security to focus on more pressing concerns, Smith said.

“It went relatively well,” Smith said. “It certainly was not some people’s favorite decision that we made, and they would wear their comforters as ponchos. So we had to have some delicate conversations with a few people, but the purpose … is to actually improve everyone’s concert experience.”

Les Schwab Amphitheater’s sustainability program, the Take Note Initiative, will continue this year, including a requirement for all vendors to use 100% compostable dishes. Reusable Silipints for beer, wine or cocktails can be purchased for $20, and attendees will receive $1 off each future beverage purchase with the Silipint.

“We’ve got our own staff managing the recycle stations, and, of course, (we) always encourage people to bring their own canteens and fill them with water inside the venue,” Smith said.”

On the administrative side, the Ticket Mill moved inside the new Grafletics location next to Tumalo Art Company in the Old Mill District.

“(That) will give customers better hours — it will be seven days a week and full retail hours,” Smith said.

Last year, the amphitheater held a record 17 concerts. The number is down to 13 this year, with a mix of newcomers and returnees. Season openers Jason Isbell and The 400 Unit and Father John Misty will play their first Les Schwab show, as will live hip-hop band The Roots (June 15); New Orleans jazz phenom Trombone Shorty (July 5); and new wavers The B-52s, OMD and Berlin (Aug. 10).

Michael Franti & Spearhead will return for the 10th year in a row June 27, this time on a co-bill with Ziggy Marley. Slightly Stoopid, a regular amphitheater presence since 2016, will be back July 13. And classic artists Lyle Lovett and His Large Band (June 29) and Robert Plant and the Sensational Space Shifters (Oct. 3) will come back after some years away.

“We’re happy with the mix of genres, and we’ve got some new blood in the lineup as well, which is delightful,” Smith said.

Isbell and Father John Misty are at the vanguard of the modern alt-country and indie-folk movements, respectively. The former started his career as a songwriter in his home state of Alabama before joining Drive-By Truckers in 2001. After leaving the band in 2007, Isbell focused on his solo career, forming his band, The 400 Unit, in 2009 and releasing his breakout record with the group, “Southeastern,” in 2013.

His latest album with The 400 Unit, 2017’s “The Nashville Sound,” peaked at No. 4 on the Billboard Hot 200 and won Best Americana Album at the 2018 Grammy Awards. The single “If We Were Vampires” also won the Grammy for Best American Roots Song. The live set “Live at the Ryman” followed in October.

Father John Misty, born Joshua Tillman, started his solo career as J. Tillman in the early 2000s with a pair of albums released on CD-R. After a brief sojourn as Fleet Foxes’ drummer from 2008 to 2012, Tillman debuted the Father John Misty moniker on his 2012 album, “Fear Fun.”

Over the course of four albums, Tillman established Father John Misty as an outsider alt-folkie with a penchant for passionate yet ironic, often humorous storytelling. His most recent album, “God’s Favorite Customer,” was released last year to high praise from publications and websites such as Rolling Stone, Pitchfork and The AV Club.