Are there differences in observances for the Three Weeks and Tisha BAv in different Jewish communities?
There are some differences in mourning observances, but essentially they are minor. Below are some interesting takes from different communities. Chatham Memorial Synagogue, Kent, UK http://www.chathamshul.fsnet.co.uk/tisha_b_av.html Yemenite customs Daily Halacha http://www.dailyhalacha.com/Display.asp?PageIndex=&ClipID=946 The Syrian Sephardic Minhag Midrash Ben Ish Hai http://www.midrash.org/halakha/22days.html Ben Ish Hai customs; Al Naharot Bavel recording Persian Rabbi http://www.persianrabbi.com/content/view/214/49/ Quick reference guide to laws and minhagim, with differences between Ashkenazi and Sephardi customs. Related: Jewish Path /Bnai Noach Institute http://www.jewishpath.org/hdourtearsandprayers.html Introductory article, Tisha B’Av. Suitable for wider community.