Corporate event planning timeline: from D-120 to D+15

What is a planning timeline (reverse schedule)?

A reverse schedule is a calendar built backwards: you start from the event date and work back to today, placing each task at its deadline. It answers three questions: what, who and when. Its main value is that it reveals dependencies: you cannot send invitations without a venue, order catering without an estimated headcount, or sort out the technical side without a floor plan.

The template below suits a corporate party, a seminar or an end-of-year party for 100 to 200 people. For afterwork drinks, halve the lead times; for a convention with several hundred participants, double them. In busy periods, especially June and December, add a month to every booking deadline.

Which planning timeline should you follow, from D-120 to D+15?

Which tasks fall behind most often?

On most events, the same steps slip. Knowing them means you can schedule them earlier or build in some slack:

• Budget approval: a budget not settled by D-120 pushes back every booking. Set a per-person budget at the scoping stage.
• The guest list: without a reliable headcount, the venue, catering and bar are sized by guesswork.
• Speakers’ presentations: they arrive the day before if no deadline is set. Require them by D-7.
• Permits: use of public space, late opening, drones. Read our article on event permits in Marseille and start the paperwork before D-60.
• Dietary requirements: ask for them in the registration form, not by separate email.

How to manage day-to-day follow-up?

A planning timeline is only useful if you stick to it. A few simple rules:

1. A single shared document, such as a spreadsheet, with columns for task, owner, deadline, status and comments.
2. A fifteen-minute weekly check-in with the people involved, then daily in the final week.
3. Clearly identified sign-off milestones: venue, budget, running order. Until they are approved, the next tasks wait.
4. A margin of 10% on both deadlines and budget to absorb the unexpected.
5. A decision log: who approved what and when, to avoid going back over settled points.

How to divide up the roles?

A corporate event often involves several departments. The project manager keeps the planning timeline and makes day-to-day decisions; management or the works council (CSE) board approves the milestones; communications handles invitations and materials; facilities look after access, parking and security. On the day, a dedicated coordinator frees the project manager to welcome guests and represent the company.

Which financial milestones should you anticipate?

The planning timeline is also a cash-flow calendar. Venues and agencies usually ask for a deposit of 30 to 60% on signature; the balance is due before the event or on receipt of the invoice. Put each deposit in the calendar and check the cancellation terms before signing: from what date does the deposit become non-refundable? What happens if the headcount falls by 20%? Our article on event deposits and cancellation explains these clauses in detail.

What happens after the event?

The planning timeline does not end on the evening of the event. By D+15, the event should be wrapped up: satisfaction survey sent and analysed, photos shared, invoices checked against the quotes, lessons recorded for next time. This review is the basis of next year’s planning timeline, and it will be all the more useful if it is written while memories are fresh. To choose the right indicators, see our article on measuring the success of an event.