Last night, the worlds of many collided with the purpose of musical celebration. With respect to their semi-annual Halloween tradition, Phish played the music of David Bowie. John Mayer attended, dressed like a rainbow unicorn and rode the front rail. And Ed O’Brien, too, attended the three-set performance at the MGM Grand Garden Arena in Las Vegas. The Radiohead guitarist sported glow sticks in his wristband and even brought home a show poster, as evidenced in the photo below posted by bassist Mike Gordon.Of course, there were plenty of exciting attendees in the ~17,000 people there. But the circle keeps getting smaller, while the Phish keeps getting bigger. Photos like these make us smile.