A secretarial practice is a recurring-work business with an unforgiving calendar
The work is known in advance, which is exactly why it gets left late
Unlike most professional services, a company secretary knows in January roughly what the year holds. Each entity carries a predictable set of recurring obligations, and new work arrives on top of that baseline. The paradox is that predictable work is the easiest to postpone: nothing is urgent until suddenly everything is, and the practice spends four weeks of the year in a state that would be avoidable with a calendar.
Scheduling recurring engagements ahead as dated tasks against each entity turns the year into something you can staff. You can see in advance which weeks carry three times the normal load, which associate is carrying too many entities in the same period, and which clients habitually deliver documents late enough to create the crunch. None of that is visible when the calendar exists in a partner's head.