An alternate juror will be appointed to the regular jury if one of the primary jurors falls ill and/or is excused by the judge from further attendance. If there is more than one alternate, the alternate juror chosen first will be assigned first.
They are called alternate jurors. In the event that a member of the jury is not able to participate in the trial any longer, the alternate will take their place.
Tom Robinson's trial takes place in August 1935.
In a hospital
I'm assuming you mean the Scopes Trial, which took place in a small town of Tennessee in 1925.
The Tom Robinson trial in "To Kill a Mockingbird" took place in the month of August.
Dayton, Tennessee, USA
In the bowls of Ethiopia
appellate courts
The trial scene was filmed in Charlotte Court House, Virginia.
The Scopes Trial took place in Dayton, Tennessee from July 10 to July 21, 1925.
Appeals courts do not hear trials.
It should be held where the crime was committed.