The last Mishnah in Ta'anis states: Rabbi Shimon ben Gamliel says, "There were never happier days for the Jews like the fifteenth of Av and Yom Kippur for on those days the daughters of Jerusalem would go out and dance in the vineyards…" "Tu B'Av" - the fifteenth day of the month of Av is a day which after the difficult and painful days of Tisha B'Av is supposed to be a day of unity and of joy. It
The last Mishnah in Ta'anis states: Rabbi Shimon ben Gamliel says, "There were never happier days for the Jews like the fifteenth of Av and Yom Kippur for on those days the daughters of Jerusalem would go out and dance in the vineyards…" "Tu B'Av" - the fifteenth day of the month of Av is a day which after the difficult and painful days of Tisha B'Av is supposed to be a day of unity and of joy. It 
