You can see these two DJs in Vegas on a regular basis with Porter Robinson up until recently was a resident DJ at Wynn properties, (XS nightclub, Surrender Nightclub and Encore Beach Club), and Deadmau5 was a resident DJ at MGM Grand. It looks like neither of them currently have a residency in Las Vegas. Deadmau5 did recently just pop into XS nightclub to open for Wolfgang Gartner for free in November, see more. Porter Robinson recently finished up his residency at Surrender Nightclub on Friday, December 27th.
We are not really sure how this started but you can read the exchange for yourself below!