straw-hat
adjective
ˈstrȯ-ˈhat 
variants or straw hat
: of, relating to, or being summer theater
For the performers, the so-called straw-hat circuit of summer theaters offers a chance to flex artistic muscles that might otherwise go soft. 
People Weekly
People Weekly
Word History
Etymology
from the former fashion of wearing straw hats in summer
First Known Use
1935, in the meaning defined above