Service stoppers

Unfortunate things happen...

Someone collapses before the service.
Someone passes out during the service.

Sometimes really bad things happen...

The minister has a car accident on the way to the church.
Someone calls the church threatening to blow up the building.
A child goes missing.

Sometimes the unimaginable happens...

Someone dies just prior to or during the service.
The minister has a heart attack five minutes into the service.
Someone walks into the church building with a weapon.

I've heard of all the above happening. For some, I've been in the church when they have occurred.

I wonder, what does it take to cancel a church service? Where is the line drawn? Does the size of a church come into the equation? (Since cancelling a service for 500 is different than stopping a service for 80)

I'm fairly confident in declaring that the vast majority of churches have little idea what they would do if any of the above situations played out this Sunday, never mind if they would pull the plug on the church service.