The Ocean State Reggae Festival marks its fourth year at Ninigret Park, in Charlestown, and co-organizer Sherri Rowe, of Mystic, Conn., says that the fest will continue to stick to the traditions of the music.

The festival features roots reggae, Rowe says — the drum-bass-guitar-keyboard based music made famous in the ’60s and ’70s — even though dancehall, the highly electronic, hip-hop-influenced branch of reggae, has been taking over in the popularity sweepstakes in recent years.

The dancehall artists tend to be more risqué in their lyrical content, though, and Rowe says she and her husband are running a family-oriented festival: “We want to make sure that Ninigret welcomes us back every year.” Besides, dancehall, as the name implies, is more for the nightclub; roots reggae is more apropos for a day in the Ninigret sunshine.

And while the festival includes veterans such as Pato Banton and Morgan Heritage, Rowe says they’ve found enough young roots artists that they’ve opened up a second stage for this year’s festival. She’s most excited about Eric Smith, who will sing with Dubnotix. “He’s very Marley-esque in his sound, and he has a bit of his own style. And so young.”

The second stage will also feature a Trinidadian carnival by Boston’s Dynasty Productions. “They have all the feathers and the big costumes — very fun,” Rowe says.

The festival drew 1,200 people in its first year, Rowe says; last year saw 3,000 attendees. She attributes the increase to the she and her husband, Philip, have done, but also to the enduring popularity of the music itself.

“It is a peaceful music, and I think we are going through some tough times, not just economically but with the war, and people look for that soothing, peaceful music.”

The Fourth Annual Ocean State Reggae Festival is at Ninigret Park, off Route 1 in Charlestown, from 1 to 11 p.m. Saturday and Sunday. Tickets are $40 a day in advance, $50 a day at the door. Go to www.oceanstatereggae.com.