Are there any specific tefillos to say on tu b’av? Is the actual day a segula or something you should do on the day? Or were any segulos only in years gone by when they’d go out in white dresses… Thanks!
See the mishna end of taanis. There is an excellent article called Dancing in the Streets on the Aish website by Rabbi Ari Kahn, The mystical roots of Tu B’Av — one of the most important days of the Jewish year.