Time for Some Music - View this location on map 'At the Brooklyn Museum's monthly First Saturday series (718-638-5000), admission is free and the exhibitions are open late. But you're there for the music. In the vast Beaux-Arts Court, an amazingly diverse crowd crams together to dance. When things slow down - or if it's not the first Saturday of the month - head to Southpaw (125 Fifth Avenue, 718-230-0236; $10 to $15 cover), a fairly large club in a former 99-cent store that's been host to everyone from KRS-ONE to the Go! Team since it opened in 2002.'' New York Times 200 Eastern Parkway, Brooklyn, NY Nightlife, Cultural, Local spot,

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