This is a custom of the Passover seder ( the order of the retelling of the exodus and the meal eaten at that time). The proper way is not to set a place, but to pour a glass of wine. At the directed time the door of the house is opened and Elijah is invited in. Since Elijah is traditionaly supposed to announce the messiah we hope that this year he will make the announcement. He is therefore invited in and visits every jewish household to take a sip of wine at the seder. As an extra note, a chair is left empty at every bris (circumcision ceremony) for Elijah. Since he will announce the messiah he is invited to every bris in case that child is the messiah.
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Name : Steve-R, Gender : M, Sexual Orientation : Straight, Race : White/Caucasian, Religion : Jewish, Age : 52, City : New York, State : NY, Country : United States, Occupation : Lawyer, Education level : Over 4 Years of College, Social class : Upper middle class,