1,375. Stringencies of the Later Fasts

Hilchos Taaniyos 3:7

These latter fasts are more stringent in other ways, as well. Only on these fasts do we sound trumpets, pray in the town square, call upon an elder to rebuke the people to change their ways, add six brachos to the morning and afternoon services prayers for a total of 24, and close the stores. On Mondays, the doors of the stores are left a little bit open and towards evening they may be opened altogether. On Thursdays, stores may be open the entire day so that people can shop for Shabbos. If a store has two entrances, one should be opened and the other closed. If there is a display area in front of the store, it may open as normal on a Thursday.

Hilchos Taaniyos 3:8

If these latter fasts go by without being answered, we minimize our business dealings, joyful construction projects such as decorating ceilings and walls, joyful planting such as myrtle trees, and erecting tents. We minimize betrothal and marriage except for one who has not fulfilled the mitzvah of procreation. One who has fulfilled the mitzvah to procreate may not engage in marital relations during a time of famine. We also reduce exchanging greetings; Torah scholars should not extend greetings at all. Rather, they should act like one who has been rejected and turned away by God. If a lay person greets a scholar, they may return the greeting in a muted fashion.