Flop costs?

If this event ABSOLUTELY flops, what would it cost us?
Predictably, what is the worst that could happen?

Church leaders like to say that failure is an okay option... (not preferred, but an acceptable outcome)

Some new activities churches try will fail. They will flop. And it may not be their fault.

But failure is only a danger of they are willing to try something.

Try a new lunchtime group in the local school.
Try to connect with their neighbours by hosting a block party.
Try to engage seekers by hosting an Alpha course.

Sometimes we need to ask the opening questions of this post and decide to put our finances, facilities and egos at risk.

Responsibly, what is the worst that can happen?

The family BBQ is a flop? It costs us sausages.
No one comes to the marriage enrichment course? The leader may be sightly embarrassed.

Perhaps, if we weigh up these relatively insignificant costs against the potential rewards, we would be willing to try more things???