Q. If there is a bris in a large shul at a different minyan than the one being attended by my minyan, do we say Tachanun?

A. Horav Shlomo Miller’s Shlit’a opinion is that if the one’s making the bris are members of the shul and daven there, since they are actively part of the rest of the mispalelim – members group, they would exempt all participant in all minyonim, before or after, from saying tachanun. However, occasional visitors or renters making a bris in that shul, will exempt only their minyan.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a