Reply To: Zecher LaChurban

In Sief Beis (2), the Mechaber says that at meals (rather feasts and dinners) one should be reminiscent to the destruction of the Beis HaMikdash by leaving over some space on the table and omitting a course (that is visible). The Taz adds that the Din is the same at a Seudas Mitzvah, such as a Bris and wedding). The Mor Uktzua however, states that on Shabbos and Yom Tov nothing should be missing (Magen Avraham). The Levush (as understood by the Mishne Berurah) claims that leaving a space on the table is unnecessary.