Consider this as a game theory problem involving Byzantine Generals Problem. 
There are three persons - Alice, Bob and Mallory.
Create a series of questions to ensure they can arrive at a consensus to meet a certain place at a certain time without relying on a trusted third party.

Express these questions as a step-by-step workflow that each party should follow so that without divulging the member's identity, all of them can agree on a certain truth
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