Authorities are bracing for an estimated 3,000 to 6,000 bikers and rock and country music fans expected to attend the Boondock Bikers Bash Friday through Sunday.

Organizers say the three-day event will be a peaceful gathering of motorcycle enthusiasts."We want this to go over smooth so there could be the possibility of it happening again," said Anna Carney of American Bikers Aiming Toward Education, the anti-helmet-law group organizing the concert.

"We really don't think there's going to be anyone go through and trash the town. That's just something that happened 20 years ago. We would like to dispel that sort of myth," she said.

Some residents aren't so sure.

"I'm apprehensive myself," said Hector Cantu, a store owner, "because I've seen some of these groups come through before. They don't represent quite as good tactics as some people think. Usually, if there's one motorcycle gang, there's two of them. That's when it disrupts the town."

"The groups we hear might be coming aren't exactly at peace with each other," said Duchesne County Sheriff Clair Poulson.

The concert will be held in a pasture surrounded by red-rock cliffs. The sheriff will have a command post set up a half-mile down the road and officers will patrol the fence surrounding the site.

Eight Utah Highway Patrol units will be on hand to watch traffic and a SWAT team from the state prison will be available in case an arrest has to be made inside the concert area.

From their experience with the Widowmaker Hill Climb, Draper police have told Poulson to expect a certain amount of drugs and lewdness.

"I don't want to tell anyone that that's OK with us, because it's not," he said. "But we won't be out looking for those problems. Our people have been instructed to be very low-key in the concert area."

The concert is expected to be a boon for the local economy as well.