We need to nail down the date for the party.
nail down
idiomto make something (e.g. a decision or plan) firm or certain
After weeks of discussion, the team finally nailed down the details of the new project.
The diplomats worked through the night to nail down an agreement before the deadline, knowing that any ambiguity could unravel months of careful negotiation.
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another nail in someone's coffin
An event that increases the likelihood of or causes further failure.
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final nail in the coffin
Something that is ultimately responsible for a previously prospective demise or failure.
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hit the nail on the head
To identify something exactly; to arrive at exactly the right answer.
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last nail in the coffin
Alternative form of final nail in the coffin.
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nail the hammer on the head
Nonstandard form of hit the nail on the head.
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the nail that sticks out gets hammered down
Those who are too different or conspicuous get criticized or sanctioned by others.