Las Vegas is a 24-hour vortex of self-marketing. So last year, Bruno Mars ingratiated himself into that beautiful abyss with his music video for the megahit "24K Magic." Not only does his video display the front of the MGM hotel properties that employ him, the singer gambles in the video while instructing you to "spend your money like money ain't shit." Now, he’s back in Sin City for what is sure to be a, well, magical concert. Bruno Mars 9 p.m. Saturday-Sunday in the Monte Carlo hotel. Bruno's Saturday after-party is after midnight in the Bellagio hotel's Bank nightclub.