In To Kill a Mockingbird, what event has been added to the fall social calendar in Maycomb? Why was it added?

Halloween events changed. It had heretofore been an unorganized event in which children got into mischief. The year before, they--presumably all the children in Maycomb, although Scout (narrating) denies having been involved--played a prank. They waited until the spinster ladies who lived in a house with a cellar (the only cellar in Maycomb) had gone to bed, then sneaked into their living room and moved "every stick of furniture" into the cellar. The ladies called...

Halloween events changed. It had heretofore been an unorganized event in which children got into mischief. The year before, they--presumably all the children in Maycomb, although Scout (narrating) denies having been involved--played a prank. They waited until the spinster ladies who lived in a house with a cellar (the only cellar in Maycomb) had gone to bed, then sneaked into their living room and moved "every stick of furniture" into the cellar. The ladies called the sheriff and asked for the bloodhounds to be put on the trail of the "thieves." 

Thus, the "Maycomb ladies" decided things would be different this year, so they organized a fair of sorts in the high school auditorium, featuring "apple-bobbing, taffy-pulling, pinning the tail on the donkey for the children," and a pageant.