It was a busy but relatively smooth Fourth of July weekend for Edgartown police, who made several drunk driving arrests, assisted some intoxicated revelers who lost their way and handled crowd control during the jam-packed holiday parade and fireworks display on Sunday.

Officer Stephanie Immelt said police responded to 120 calls, not including routine calls for house alarms, suspicious activities and traffic stops.

“It was very busy, but overall pretty uneventful. Considering everything that was going on, things went about as smoothly as we could have hoped,” Ms. Immelt said.

A power outage darkened downtown Edgartown just before the start of the fireworks display over the harbor on Sunday night. The outage was caused by a transformer that exploded around 8:30 p.m., knocking out power for about an hour.

With the streets flooded with people, officers used lighted wands to direct motorists and keep them separated from pedestrians.

After the fireworks were over, a New Jersey driver hit a parked police cruiser and was charged with operating under the influence.

According to the police incident report, Alexandra Budd of Montclair, N.J., was driving down North Water street in a Toyota Rav4 when she came upon the parked cruiser. She rolled down the window and asked the officer if she could drive around.

The officer told her the travel lane was open, and Ms. Budd went around but struck the back bumper of the patrol vehicle. The officer yelled at her to stop through the open driver’s side window, but she drove forward and scraped the side of the cruiser.

The officer ordered her to stop, but she accelerated and continued down North Water street. Police followed and eventually pulled her over on the sidewalk just before Morse street. Ms. Budd failed several field sobriety tests and later blew a .25 blood alcohol level at the county jail.

She was cited for negligent operation of a motor vehicle, leaving the scene of an accident with property damage, failure to stop for police, and operating a motor vehicle under the influence of alcohol.