If you're a motorcycle enthusiast, then a cow pasture a few miles west of this town is the only place you want to be this weekend.

Bikers from across Utah and the Mountain West began streaming into the Uintah Basin Friday evening for the beginning of a three-day marathon rock concert called the "Boondocks Biker Bash" featuring some well-known rock 'n' roll bands from the 1960s and '70s.By evening, about 1,000 bikers were on the 30-acre site with 6,000 more expected to arrive Saturday to hear such legendary performers as the New Riders of the Purple Sage; Black Oak, Arkansas; Canned Heat; and Spirit.

The thought of that many bikers, many from rival groups all congregating in a single spot, is causing concern among local law enforcement officials who fear a confrontation.

However, by nightfall, the event had been peaceful. Organizers of the event, the American Bikers Aimed Toward Education, ABATE, a motorcycle riding group that opposes mandatory motorcycle helmet laws, promise to keep it that way.