A double shot of day-long music festivals is coming to Arlington in September—one fest on each of the first two Saturdays of the month.

First up: the Planet Arlington World Music Festival, on September 1 from 4 p.m. to 10 p.m. at the Netherlands Carillon on the grounds of the Iwo Jima memorial grounds. Hosted by WAMU’s Kojo Nnamdi (and cosponsored by City Paper), the performances take place rain or shine and include, on the main stage, Jamaican ska mainstays the Skatalites; avant-garde Brazilian percussionist Cyro Baptista and his band, Beat the Donkey; Benny Jones Sr. and the Treme Brass Band, a New Orleans street band; Lila Downs, a Mexican-American vocalist; and legendary South African trumpeter Hugh Masekela. There’s also a second stage, sponsored by Putumayo Records, featuring family-oriented acts Asheba, Phil Melancon, and Robbi K & Bakithi Kumalo. Finally, between stage sets there will be off-stage performances in the crowd by various regional/cultural artists.

Spectators are encouraged to bring a picnic lunch to the event, which is four blocks from the Rosslyn Metro. (The city of Arlington will provide shuttle service between the Metro and the festival site.)

Second, on September 8 is the Rosslyn Jazz Festival, held at Gateway Park at North Lynn Street and Lee Highway from 1 to 7 pm. The headliner is star violinist Regina Carter, who closes the show with a 5:45 performance; other performers include legendary vibraphonist Bobby Hutcherson, local bossa nova group Origen, and singer Kevin Mahogany, performing with saxophonist Red Holloway and vocalist Kathy Kosins in a tribute to the late blues shouter Big Joe Turner.

Don’t bring your lunch to this one; food vendors will be lined up on Lee Highway near the concert site. Also, if you can’t make it out to Gateway Park, WPFW 89.3 FM will broadcast portions of the show.

Call 703-228-1850 for more information about either festival.