Chris Willman Senior Music Writer and Chief Music Critic Vampire Weekend’s matinee concert Monday in Austin was the ultimate ADHD-friendly show. Did you want to watch the band, in its first show back after a year-and-a-half break from touring, and a much longer absence in the States? That was an event unto itself, and a good enough reason for an easy sellout of the 5,000-capacity Moody Amphitheater.