The last concert I attended before the world pressed pause on large gatherings was Galantis’s Church of Galantis at San Francisco’s Bill Graham Civic Auditorium. One moment, I was in a sea of excitement; the next, I was sheltering in place. When concerts finally returned, masks had become fashionable accessories with special designs and bedazzles — though their use seems to have faded over time. Measuring changes like that is tough with data.

But one thing I can measure is interest in concert tickets.