Crowded stadiums, pandemic create combustible mix this fall

A Tampa Bay Buccaneers fan holds a sign during the first half of an NFL football game against the Dallas Cowboys Thursday, Sept. 9, 2021, in Tampa, Fla. (AP Photo/Mark LoMoglio)

Fans arrive at Raymond James Stadium before an NFL football game between the Tampa Bay Buccaneers and the Dallas Cowboys Thursday, Sept. 9, 2021, in Tampa, Fla. (AP Photo/Chris O'Meara)

Los Angeles Dodgers' Albert Pujols tips his cap to cheering fans as he steps up to bat during the seventh inning of a baseball game against the St. Louis Cardinals Thursday, Sept. 9, 2021, in St. Louis. (AP Photo/Jeff Roberson)

Tampa Bay Buccaneers fans cheer during the second half of an NFL football game against the Dallas Cowboys Thursday, Sept. 9, 2021, in Tampa, Fla. (AP Photo/Mark LoMoglio)

The Tampa Bay Buccaneers uncover their 2020 Super Bowl banner before an NFL football game against the Dallas Cowboys Thursday, Sept. 9, 2021, in Tampa, Fla. (AP Photo/Mark LoMoglio)

San Francisco Giants' Kris Bryant greets Chicago Cubs fans as he walks to the dugout before a baseball game in Chicago, Friday, Sept. 10, 2021. (AP Photo/Nam Y. Huh)

Florida State fans, almost none of whom were complying with the mandatory mask mandate, do The Chop during an NCAA college football game against Notre Dame Sunday, Sept. 5, 2021, in Tallahassee, Fla. Notre Dame won 41-38 in overtime, (AP Photo/Phil Sears)

Tennis fans applaud Emma Raducanu, of Great Britain, after she defeated Maria Sakkari, of Greece, during the semifinals of the US Open tennis championships, Thursday, Sept. 9, 2021, in New York. (AP Photo/Elise Amendola)