They have arranged to go for an outing in the countryside in late spring.
Tips
history
In the Analects, Confucius asks his students what they wish for, and 曾点 describes a spring outing that begins 暮春者，春服既成 'in late spring, when the spring clothes are ready'. Confucius sides with him.
usage
A poetic name for 季春, the last of the three spring months; 孟春 is the first.
