Tisha B’Av is observed Saturday night after Shabbat. It is a day of mourning for many tragedies in Jewish history including the destruction of both Temples. Many of the videos I posted recently explain some aspects. It is customary to recite/read/listen to the book of Eicha on Saturday night after the evening prayer (Maariv) after Shabbat is over.
PDF of Eicha in English and Hebrew – https://www.theus.org.uk/sites/default/files/Eicha_ml_v2.pdf
If you are interested in more videos please visit this YouTube Channel:
https://www.youtube.com/channel/UCjMaM6rfcyEgICMADAFTTRQ