
 The fast of  Tisha B'Av, the "saddest" day in the Jewish calendar, begins Wednesday evening  at sundown, and ends Thursday evening. 
Its name literally means "the  ninth day of [the Jewish month o Av," the date of some of the gravest tragedies  to have befallen the Jewish People.  Most notably, both Holy Temples in  Jerusalem were destroyed on Tisha B'Av, but the list of calamities on this date  includes also the following: G-d decreed, following the Sin of the Spies as  recounted in Numbers 13-14, that the Children of Israel would not be allowed to  enter the Land of Israel until the entire generation had died out.  The fall of  Beitar, the last fortress to hold out during the Bar Kochba revolt in the year  135 C.E., to the Romans. A year later, the Temple area was plowed over, marking  the last milestone of national Jewish presence in our homeland until the modern  era. The Jews of Spain were expelled by King Ferdinand and Queen Isabella in  1492. World War I erupted in 1914, setting the stage for World War II and the  Holocaust. Mass deportation of Jews from the Warsaw Ghetto to the Treblinka  death camp began on Tisha B'Av eve of 1942. The Jews of Gush Katif spent their  last legal day in their homes in Tisha B'Av of 2005, and were expelled three  days later.
Despite the sadness of the day, the saddest part of the  regular daily prayers - tachanun - is not recited, in the anticipation of the  final joyous Redemption that will render Tisha B'Av a day of  joy.
Many tens of thousands of people spend Tisha B’Av, or parts  of it, at the Western Wall – which, together with the Temple Mount, is the sole  remnant of the Second Temple. Visitors spend hours mourning the destruction, the  Exile of the Divine Presence and the unredeemed state of the Nation of Israel by  reciting and studying the traditional Tisha B’Av lamentations and the Scroll of  Eichah (Lamentations). 
March Around the  Old City
The traditional Women in Green Tisha B'Av March around the  Old City will begin at 8 PM with evening prayers and the reading of Eichah,  followed at 9:30 by the march towards the New Gate, Damascus Gate, a short  ceremony at Lions' Gate, and culminating at Dung Gate near the Western Wall  around 11 PM. Thousands of people generally participate in the march.
The  Egged bus cooperative will be adding bus lines on Wednesday and Thursday to the  Wall. Buses will leave the Wall as late as 2 AM Thursday morning, and resume  again four hours later. In addition, an Egged shuttle service will take  passengers every ten minutes on Wednesday night and Thursday from the Carta  parking lot outside Jaffa Gate to the Wall. 
Bus service to Rachel’s  Tomb, south of Jerusalem, and to the Machpelah Cave in Hevron, will also be  reinforced.
Israeli law forbids the opening of restaurants, clubs and  theaters on Tisha B’Av. However, various events, organized by both religious and  secular, will be held to discuss the contemporary and traditional significance  of the day. In Haifa, Mayor Yona Yahav, Science Minister Rabbi Prof. Daniel  Herskovitz, and author A. B. Yehoshua will hold a panel discussion on Wednesday  night on “Spiritual Needs and Tisha B’Av.” In Tel Aviv’s Beit Daniel, a session  on Exile and Jewish Wandering will be held Wednesday evening, while in the  Tzavta Theater, Eichah and modern will be read aloud. 
On Thursday in  Jerusalem’s Beit Avichai, the roots of hatred in human society will be discussed  in the context of movie-making in Israel.
The Sages enacted Yom Kippur-like restrictions on Tisha B'Av, including no  eating, drinking, washing, or marital relations. Leather shoes are not worn, and  even Torah study -- a major source of Jewish joy -- is restricted to topics  connected with the Destruction of the Temples, prophecies of rebuke, Tisha B’Av,  and the like. Sitting on chairs is not permitted until the afternoon.    
The hour before the onset of Tisha B'Av is marked by a “mourning  meal,” consisting only of a hard-boiled egg dipped in ashes, bread, and water.  It should be eaten while sitting on low stools or on the floor, with each person  sitting alone in a different corner of the room.
The regular evening  prayer service is followed by the reading aloud, in a traditional mournful  melody, of Eichah.