Bonjour / Hello [nickname_else_first_name],
Tisha B'Av (Hebrew: תִּשְׁעָה בְּאָב[a] Tīšʿā Bəʾāv; IPA: [tiʃʕa beˈʔav] (
listen), lit. 'the ninth of Av') is an annual fast day in Judaism, on which a number of disasters in Jewish history occurred, primarily the destruction of both Solomon's Temple by the Neo-Babylonian Empire and the Second Temple by the Roman Empire in Jerusalem.
Tisha B'Av marks the end of the three weeks between dire straits and is regarded as the saddest day in the Jewish calendar, and it is thus believed to be a day which is destined for tragedy.[2][3] Tisha B'Av falls in July or August in the Gregorian calendar.
The observance of the day includes five prohibitions, most notable of which is a 25-hour fast. The Book of Lamentations, which mourns the destruction of Jerusalem, is read in the synagogue, followed by the recitation of kinnot, liturgical dirges that lament the loss of the Temples and Jerusalem. As the day has become associated with remembrance of other major calamities which have befallen the Jewish people, some kinnot also recall events such as the murder of the Ten Martyrs by the Romans; expulsions from England, Spain, and elsewhere; massacres of numerous medieval Jewish communities during the Crusades; and the Holocaust.
-Wikipedia

Halachot Tisha Be'Av according to the rulings of Rabbi Obadiah Yosef ZT”L
Is it allowed to take a walk on the evening of Tisha Be'Av?
One should not be taking a walk in the evening of Tisha Be'Av. In the city of Yerushalayim those who walk to the Western Wall on the evening of Tisha Be'Av, and meet their friends there and chat and are having a great time are not following the Halacha properly.The purpose or intention of gathering together at the western wall or at the synagogue during Tisha Be’Av is strictly for prayers and not for a trip or a meeting.
There is no greeting anyone with Hello etc… on Tisha Be'Av, however if a person who does not know about this custom and greets you, it is permissible to reply in soft language and with seriousness.
What shoes are prohibited during Tisha Be'Av?
It is forbidden to wear shoes or sandals made of leather, but shoes made of cloth or rubber are allowed.
People who are ill or women giving birth within 30 days, they are allowed to wear leather shoes.
It is forbidden to wear leather shoes during the entire period of the Ta’anit (fast), until the evening of Tisha Be'Av when the stars come out.(Tzet Hakochavim) If someone forgot to buy rubber shoes for Tisha B'Av, he is allowed to buy them during the three weeks, but it is better that he wears them for a while in the week before Tisha B'Av so they are considered new.
Have an easy fast
Bivracha
David Azerad