Democrats would ban high capacity stadiums.

Stampede at Indonesian Soccer Match Leaves 129 Dead and 180 Injured (VIDEOS)
A stampede at an Indonesian soccer match left 129 people dead on Saturday evening.
The deadly incident took place at the Kanjuruhan Stadium in the city of Malang in East Java province.

Of course, making attendees fill out 4473s and undergo background checks would probably trigger a riot in itself.

No one needs to attend a sporting event.