LOS ANGELES (AP) — Wall Street protesters in Los Angeles defied the mayor's early Monday deadline to vacate their encampment near City Hall, with about 1,000 flooding into the area as hundreds of tents remained standing as they have for nearly two months.A celebratory atmosphere filled the night with protesters milling about the park and streets by City Hall in seeming good spirits. A group on bicycles circled the block, one of them in a cow suit. Organizers led chants with a bull horn."The best way to keep a non-violent movement non-violent is to throw a party, and keep it festive and atmospheric," said Brian Masterson.Police presence was slight right after the 12:01 a.m. PST Monday deadline, but it began increasing as the morning wore on.