Circus enters Soldier Field for Labor Day, c. 1927. The Chicago Federation of Labor (CFL), a major union, hosted some spectacular Labor Day celebrations at Soldier Field in the 1920s. Edward N. Nockels, the CFL’s secretary, wrote this letter advertising the 1927 festivities. For $1, people could see soccer and boxing matches, a circus, and airplane stunts all at Soldier Field. Kids, adults, and even a few elephants sometimes marched into Soldier Field for the Labor Day revelry. ICHi-64210.