How is jem showing maturity in chapter 27 of to kill a mockingbird

They begin with a reference to the Radley Place, the source of childhood terror that no longer scares Jem and Scout—“Boo Radley was the least of our fears,” Scout comments. The dissipation of Jem and Scout’s youthful fear of Boo reflects how the trial has hardened them and how, in the wake of the trial’s injustice and Bob Ewell’s threats, the children have become increasingly mired in the more serious concerns of the adult world.

Awnser: By the middle of October, Bob Ewell gets a job with the WPA, one of the Depression job programs, and loses it a few days later. He blames Atticus for “getting” his job. Also in the middle of October, Judge Taylor is home alone and hears someone prowling around; when he goes to investigate, he finds his screen door open and sees a shadow creeping away. Bob Ewell then begins to follow Helen Robinson to work, keeping his distance but whispering obscenities at her. Deas sees Ewell and threatens to have him arrested if he doesn’t leave Helen alone; he gives her no further trouble. But these events worry Aunt Alexandra, who points out that Ewell seems to have a grudge against everyone connected with the case.

That Halloween, the town sponsors a party and play at the school. This plan constitutes an attempt to avoid the unsupervised mischief of the previous Halloween, when someone burglarized the house of two elderly sisters and hid all of their furniture in their basement. The play is an “agricultural pageant” in which every child portrays a food: Scout wears a wire mesh shaped to look like ham. Both Atticus and Aunt Alexandra are too tired to attend the festivities, so Jem takes Scout to the school.

explanation:

it refers to the definition of full-contact sports, where the condition is that the sport must have athletes must "purposely collide with each other