Officers on patrol came across the fight at 1:10 a.m. in front of the Shiro Lounge at 1523 Giammona Drive.
Approximately 15 people were involved in the fight, police said, and one person was on the ground as officers arrived.
As police tried to break up the fight, one officer was punched in the face.
As police tried to take that suspect into custody, identified by police as Richmond resident Davon Kelly, 27, police used a Taser to subdue him.
Two bystanders, identified by police as Pittsburg residents Donte Lewis, 25, and Davonte Lewis, 19, attempted to keep officers away from Kelly, police said, and were arrested for obstructing an officer.
Police said that despite orders to disperse, other small fights started breaking out between others in the group.
Another suspect, identified by police as Desirae Chapple, 21, of Concord, attempted to punch an officer in the face as police attempted to arrest her for obstructing officers, police said.
Police said that the fight began after a gold chain was robbed by a man inside the Shiro Lounge, which was hosting a private party prior to the fight.
The victim of that robbery was uncooperative with authorities, police said.
The three others arrested were San Francisco resident Gia Thompson, 23, and Oakland resident Devon Edwards, 21, who were both charged with obstructing an officer.
Kelly was taken to a local hospital for a medical valuation which is standard procedure when a Taser is used, police said. Chapple was also taken to the hospital and treated for pepper spray exposure.
The remaining suspects were taken to Martinez County Jail.
All available Walnut Creek police responded to the incident, as well as California Highway Patrol officers and Contra Costa County Sheriff's deputies.