You are organising an outdoor wedding and need a practical backup plan.

Complete the conditional shown above. Make the ending specific to this situation, rather than choosing a random grammatically possible clause.

1. Finish it. Complete the sentence with a realistic plan and explain what will trigger it.
2. Say it naturally. Read the complete sentence aloud and check that the meaning is clear.
3. Go further. Add one sentence explaining the situation or consequence.

Extra challenge: Change an important detail in the situation and produce a new conditional that fits.