When the NYC nightlife impresario and club known only as Mr. Black gets bored with the Big Apple, there’s only one place to play anew: L.A., of course. The pansexual dance party, Mr. Black, will make its big debut this Tuesday, and though the buzz on the West Coast version is almost as mysterious as the name, here’s what we do know: Riley More (Big Fat Dick, Space Is the Place) will spin a bodacious floor-bumping mix along with biggie guests. Co-hosts include some fab Cali club characters (Lenora Claire, Gregory Alexander and Rusty Updegraff). Good enough for us — and you. Dress to express. Bardot, 1735 N. Vine St., Hlywd., mrblacknyc.com. That same eve, a new bash debuting at the 3 Clubs, re-Sessions, sounds equally promising. DJ Freakstyles and guests spin, go-go dancers grind and the power-pop local heroes the Fizzies play. Each week will offer a different musical-genre theme. 1123 Vine St., Hlywd., threeclubs.com. Both clubs, on Tues., Sept. 15.