Jun. 7--LAWRENCE | - LAWRENCE | The crowds at the Wakarusa Music and Camping Festival have grown. So, too, has the police presence.

The number of law enforcement officers at the four-day event, which kicks off Thursday outside Lawrence, will be roughly double that of last year. Police expect to have their hands full with traffic accidents, drug and alcohol violations, and -- thanks to a hot forecast -- heat stroke and dehydration.

The festival at Clinton Lake will feature nearly 150 diverse bands on multiple stages. Many attendees will stay in campsites surrounding the venue. Gates open today for early arrivals and close Monday. Tickets were sold in all 50 states and as far away as Japan and Germany. About 15,000 people are expected to attend.

"It's the size of a small city," said Lt. Kari Wempe of the Douglas County sheriff's office.

The sheriff's office will have five to 19 deputies at the event at any given time, compared with three to 11 per shift last year. The Kansas Highway Patrol, which has never staffed Wakarusa before, will have 17 officers at the event. Ambulances and emergency medical technicians also will be on call.

A 29-year old Florida man died of a drug overdose at last year's festival, another man went missing for days, and a few dozen citations were issued for drug and alcohol violations. That's par for the course for large musical festivals like Wakarusa, but it still was cause for concern for festival organizers.

The overdose death "was a very sobering event," Wakarusa organizer Brett Mosiman said. Mosiman prefers to call police "security," but he acknowledged that music festivals can attract some of the worst legacies of the flower-power era.