The Mishna in Ta'anit (4,7) says לא היו ימים טובים לישראל כחמישה עשר באב וכיום הכיפורים - There were no greater days for the Jewish people like the 15th of Av and like Yom Hakippurim.
Tu Be'av (the 15th of Av) throughout history symbolized the end of a period of trouble and the beginning of a period of joy. We see this from the list of occurances the Gemara brings down that occurred on Tu Be'av.
Rav Amnon Yitzhak chose this date to hold his "Humility Parade" at Teddy Stadium - also coinciding with the planned but cancelled Abomination Pride Parade.
May Tu Be'av herald in better times for the Jewish people. May all our sorrows be forgotten starting this Tu Be'av.