When I was in the cult I know that some congregations had their memorial at an outside, rented facility such as a school auditorium or a hotel banquet room. This was in cases where, say, 3 congregations shared the hall. For example the North Congregation, the South congregation, and the Spanish Congregation. Each year one would take a turn having theirs offsite.
Or some halls were very small yet the memorial attendance is always so large they need an outside facility.
Either way it's a waste of time. The old ladies would get their hair done and the men would get haircuts, and everyone would dress up. Just to hear the same talk each year and pass around "the elements" that you were not allowed to partake of. All the inactive ones would come out of the woodwork as if showing up for this event would somehow earn God's favor...a way of saying "yes I am still in". People inviting as many as possible just so this year's numbers can be higher than last year's.