The period leading to this holiday is termed Bayn 
The period leading to this holiday is termed Bayn Ha-Metsarim, during which marriage is prohibited, and in the Shabbat Hazon preceding this holiday, the blessing of wine during havdalah is postponed to Sunday night. The eve of this day sometimes sees the consumption of a boiled egg sprinkled with ashes. As during any period of shiva, it is prescribed to sit on low stools during this holiday, and studying any but a few sad tractates is forbidden as it is an enjoyable activity. This holiday sees the reading of the Kinnot and of Aycha, the book of Lamentations, in the afternoon, and it commemorates, among other calamities, the destruction of the First and Second Temples of Jerusalem. For 10 points, name this mournful summer holiday occurring on the namesake ordinal day of a certain Hebrew month.
The period leading to this holiday is termed Bayn Ha-Metsarim, during which marriage is prohibited, and in the Shabbat Hazon preceding this holiday, the blessing of wine during havdalah is postponed to Sunday night.
 Tisha b'Av [or Ninth of Av]