A good brief is short. A useful brief is specific. The shortest, most useful briefs answer three questions, and the rest is detail.
1. Who is this for?
Not the demographic — the person. The job title, the moment in their week they’ll come, the thing they’ll be willing to leave their desk for.
2. What do they leave with?
One sentence. If the answer is “a positive impression of the brand” the event will fail. The answer should be something the attendee would say to a colleague the next morning.
3. How will we know?
The metric. Not NPS. Something causal: a meeting booked, a follow-up signed, a piece of work commissioned. Something that fails honestly.