Q. Can an Avel during Shiva who is used to invite a large group of guest on Friday night, while singing and enjoying great food, for the purpose of Kiruv and bringing people close to Judaism, continue to do so while he is in mourning?
A. Horav Shlomo Miller's Shlit'a opinion is that it is permitted and should actually do so. The reason being is that since he does so during every Shabbos and if he would discontinue now, it would appear as an open act of Avelus or mourning which is prohibited during Shabbos.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit'a