We have a ride that tons of cyclists do that starts at a church. When we're welcome, there's a sign that says, "Welcome Cyclists" and there's always a donation box in the lot, if the spirit moves you.

In general, we never park there on Sundays. Even if the lots empty when we get there, there's no way of knowing what's scheduled later in the day. We have seen signs on Saturdays that say, "No cyclist parking today" when they've had a special event.