The Simcha of a Siyum
A mishnah in Ta’anis declares that the most joyous holidays on the Jewish calendar are Yom Kippur and Tu B’Av. The Gemara says that Yom Kippur was joyous because the nation was forgiven for its sins.
Talmud Torah
The importance of Torah study at night as the nights lengthen after Tu B'Av, and training children to learn after dark.
A mishnah in Ta’anis declares that the most joyous holidays on the Jewish calendar are Yom Kippur and Tu B’Av. The Gemara says that Yom Kippur was joyous because the nation was forgiven for its sins.