Where there are people, there is debris, and where there is debris, there are rats … We meet Theo Anthony, the creator of “Rat Film,” a documentary that investigates Baltimore’s rat infestation, juxtaposed with its history of racist urban planning. And we talk with Karen Houppert, a journalist who documents the abundant rat carcasses she encounters in her Charles Village neighborhood. You can see ----Rat Film---- and attend a public health discussion afterwards on Sept. 21 at the Parkway Theater.