"It's just been beautiful and harmonious," said Lisa Clapier, one of dozens of protesters at City Hall. "We have families and there's music. It's almost like an art in the park celebration. It's been great."
The demonstration in Los Angeles has been a stark contrast to the one in New York, which is now in its fourth week. Several people at the Occupy Wall Street protest were arrested over the weekend. Some clashes with police have turned violent.
The demonstrators are calling for the 1 percent of rich Americans to find more ways to help the 99 percent who are not.
As of Monday night, the movement has spread to more than 250 American cities, more than 1,000 countries and every continent, with the exception of Antarctica.
A threat was allegedly made by a group of hackers known as Anonymous against the New York Stock Exchange in support of the Occupy Wall Street protest.
They did not specify what kind of attack it would be and, as the trading day closed, it appears nothing occurred.
"The trading website is not directly on the Internet itself," said Dr. Clifford Neuman of the USC Center for Computer Security. "They need access through a back channel or an insider."
Also Monday, anti-war and anti-corporate greed protesters accepted an offer by U.S. Park Police in the nation's capital to extend by four months their permit to demonstrate.
The protesters have spent the past four days camping in the Washington's Freedom Plaza near the White House.
October 2011/Stop the Machine scheduled other marches and rallies throughout the week. Its permit had been set to expire Monday and organizers said they had planned to stay put anyway.
The Rev. Jesse Jackson says the protesters' demands for "economic reconstruction" are legitimate. He says they will need to transform their protest into "voting power" to be a potent movement.