When should a planner lock the run of show and stop accepting last-minute changes?

Why a timeline that never locks is a timeline nobody trusts

Vendors read a run of show to decide what to bring, who to staff, and when to show up. If the document keeps shifting in the final days, they stop reading closely, because experience tells them the version in their inbox will not be the version on the day. That is how a caterer ends up firing dinner off a Tuesday draft while the planner works from a Friday revision. The problem is not the changes themselves; it is that nobody can tell which version is real.

A lock date fixes this by drawing a clear line: before it, the timeline is a working draft and everyone expects movement; after it, the document is the plan of record and changes go through a deliberate process. Vendors can commit staff and equipment against a locked timeline with confidence, and the planner stops fielding a new revision request every time the client has a conversation with a relative.

Keep reading: How do event planners build a minute-by-minute run of show that actually keeps the day on schedule?, How can a planner share the event day timeline with every vendor so nobody works from an old version?, What is the best way to adjust an event timeline on the fly when the day is running late?. See how GigTimelinr helps you event day-of run-of-show timeline builder.

Picking the lock date for different kinds of events

For a wedding or private social event, many planners lock the run of show somewhere between five and ten days before the event, which lines up with when final headcounts go to the caterer and when the venue finalizes staffing. For a corporate conference with production, a longer runway makes sense, often two to three weeks out, because stage cues, graphics, and speaker travel all key off the timeline. Smaller events with only a couple of vendors can lock later, sometimes within seventy-two hours. Related: How do event planners build a minute-by-minute run of show that actually keeps the day on schedule?

The right date is the one that falls just before the point where your vendors have to make irreversible commitments. Ask each key vendor directly: what is the last day you can absorb a change to the timeline without cost or risk? The earliest of those answers is your lock date. Put it in the client contract or the planning agreement so it is not a surprise, and remind the client of it a week ahead. Related: Why should every moment in an event run of show have a clearly assigned owner responsible for it?

What still changes after the lock, and how it gets in

Locking does not mean freezing. Real things happen: a speaker cancels, a grandparent is too ill to attend, the forecast turns. The distinction is between changes forced by circumstance and changes driven by preference. The first kind always gets through. The second kind, such as moving the first dance so it follows the cake instead of preceding it, should be answered with a polite explanation of what it would cost in vendor re-coordination and a recommendation to keep the plan.

Route every post-lock change through one person, usually the lead planner, who updates the master document and pushes a fresh version to every vendor with a short note about what moved. A change made by phone to one vendor and not written down is the most dangerous kind, because it creates two competing realities. If your timeline tool supports version history and a change note, use it; if not, a dated email to the full vendor list does the job. Related: How can a planner share the event day timeline with every vendor so nobody works from an old version?

Saying no to the client without souring the relationship

Most clients do not push for late changes to be difficult. They push because they are anxious and the timeline is one of the few things they feel they can still control. Acknowledge that directly. Then explain the tradeoff in concrete terms: moving the toasts later means the kitchen holds plated entrees, which means the food arrives cooler, which is exactly the thing they said they cared about back at the tasting. Related: What is the best way to adjust an event timeline on the fly when the day is running late?

Offer a version of the change that does not require re-coordination when one exists, such as adjusting the order of two items within a segment that already belongs to the same vendor. And keep a short list of the reasons the plan looks the way it does; when a client asks to alter something, being able to say 'we put that there because the photographer needs the light at that hour' ends most debates faster than any amount of pushback.