How big is football in Europe?

From Division of Labor we have:

The renowned Vienna State Opera canceled one performance and complained about dismal attendance at another, blaming the European soccer championship being played in the Austrian capital.

Performances are usually nearly sold out, but the opera house said 29 percent of its seats went unsold for its most recent event, Verdi's "La forza del destino." The opera house also said it had decided to cancel a ballet evening June 29, the day when the final is played in Vienna.

Officials said in a statement Tuesday that would-be visitors fear negotiating through masses of soccer fans in downtown Vienna.

It is something of an understatement to say that, in the US, there is not much overlap between the opera crowd and the football crowd.

The closest might be Vikings games which often feature hefty fans in horned helmets yelling at the top of their lungs.

I wonder if he is an opera buff?