Q. I find it very hard to get together a minyan for a Hakomas Hamatzeva. Do you need a Minyan present or can you say kaddish in shul, before or after?
A. Horav Shlomo Miller's Shlit'a opinion is that it is preferable to have a minyan present, so kaddish can be recited leiluy nishmas and in merit of the deceased. However, if no minyan is available, the customary ceremony can be done without it.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit'a