Why is Calpurnia supposed to go to the backdoor at the Radley Place in To Kill a Mockingbird?

Because the radleys are black and she is also black so they have imediaet chemistry and they really hit it off then boo and cal start going out and everyone realizes that boo isnt a bad guy he is just a little crazy but scout and jem and dill really like him cause he is all like nice and stuff

ps.. this is a complete lie do not believe anything i just said

k bye.