That's happened to me, elders just dropping by. We live somewhat close to the Hall and it seems there always a steady flow of car groups that drive by. If they see us outside they drop in. A few times, I've just played with them, minimizing everything about the troof..... I'll get a confused look. Example last time they dropped off they invited me to the Sunday talk and said a guest speaker was going to give the talk and would be about the 'urgency of the days we live in', I nodded and said "oh, we made plans with friends to be on the lake, yeah that's not going to work. Maybe you can record it for me and I will listen to it when I'm not so busy". The look is priceless.
Sometimes, I will just be a smart ass. Like "Thank god we have the truth otherwise we wouldn't have a clear understanding of the overlapping generations thing, have they changed that again?". Haha, you can see the wheels falling off the wagons.
Hopefully, the hall close by will be sold off so they will have to drive 20 min in the other direction to the other hall.