Deposits arrive as a scattered calendar. Forty suppliers with different payment dates across eighteen months is a schedule, and a missed deposit is a supplier who quietly releases the date.
The budget changes weekly and the couple has to see it. A shared, current figure prevents the conversation nobody wants six weeks before the wedding, when the total has drifted and nobody noticed.
The running order is what the day actually runs on. Times, contacts, arrival slots and who is responsible for each moment: it is the document handed to every supplier, and it changes until the final week.
Several weddings run at once, at different stages. One at eighteen months, one at six and one next Saturday need completely different attention, and only a view across all of them prevents something slipping.