Can I make a shachris minyan and Bris in a conservative synagogue which no longer has any services on a regular basis ( I am not sure about the high holidays). If not, would the hallway be any different?
R’ Mםshe Feinstein Zt”l writes that we are not allowed to make a minyan in a conservative temple, even if it is in a differant room. This is because it appears like the people are going to pray together with them
Igros Moshe O:CH 3-25, O:CH 4-91(6).