The Rema paskens in O Ch 135 (2)
If they neglected [to be able to hold] the public reading of the parashah, then for the following Shabbat they read that parashah (i.e. the missed one) along with the parashah belonging to that (i.e. the following) Shabbat (Or Zarua).
Say the Congregation closes down for a Shabbos; the members went on private holidays in numerous areas with minyonim and heard the leining where they were. When they return to their regular shul building, are they required to make up the reading or not? In other words is the sedrah reading an obligation on the congregation or on the shul building? It seems obvious to me that it is an obligation on the congregation but my Chavrusah disagrees.