Why are so many people passing by the Finch house?

As the trial nears, more people come by the finch house. A group of men pay a call to Atticus at his home. Jem and Scout watch from inside. The men make allusions to Tom being moved to the Maycomb jail the next day (Sunday), because the trial will occur on Monday. They are concerned that the "Sarum bunch" will cause some trouble.