This evening at sundown begins The Three Weeks

Overview and laws of the period leading up to Tisha B'Av. From aish.com

The "Three Weeks" between the 17th of Tammuz and the Tisha B'Av have historically been days of misfortune and calamity for the Jewish people. During this time, both the First and Second Temples were destroyed, amongst other terrible tragedies.

These days are referred to as the period "within the straits" (bein hametzarim), in accordance with the verse: "all her oppressors have overtaken her within the straits" (Lamentations 1:3).

On Shabbat during the Three Weeks, the Haftorahs are taken from chapters in Isaiah and Jeremiah dealing with the Temple's destruction and the exile of the Jewish people.

During this time, various aspects of mourning are observed by the entire nation. We minimize joy and celebration. And, since the attribute of Divine judgement (“din”) is acutely felt, we avoid potentially dangerous or risky endeavors.

ASPECTS OF MOURNING DURING THE THREE WEEKS
 

1. No weddings are held. (However, engagement ceremonies are permitted.)
2. We do not listen to music.
3. We avoid all public celebrations -- especially those which involve dancing and musical accompaniment.
4. We avoid exciting and entertaining trips and activities. (Kaf HaChaim - OC 551:41)
5. No haircuts or shaving. (Fingernails may be clipped up until the week in which Tisha B'Av falls.)
6. We do not say the blessing She-hechianu on new food or clothes, except on Shabbat.

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