A demonstration is a sales activity with a follow-up cost
Field demonstrations are how new products earn credibility here, and they are usually run as events rather than as sales activities. The day itself goes well, a crowd attends, photographs are taken, and then nothing is owed by anyone. Recording who attended, which dealer hosted, what crop and area they farm and what each attendee said they would try converts an event into a list of named follow-ups. That list, worked over the following fortnight, is what turns a demonstration budget into orders.
Timing against the planting calendar decides the return
A demonstration held after the planting decision has been made is an education exercise. Held four to six weeks before, in a district where the crop is about to go in, it is a sales tool. Because the main crop, the second crop and the cane and cassava calendars run to different dates by region, the scheduling question is provincial rather than national, and it is answered by looking at what actually sold in each district last cycle rather than by copying last year plan.
The hosting dealer has to benefit visibly
Demonstrations are usually hosted with a dealer, and the dealer measures the day by the orders that follow at their counter. Recording which dealer hosted each demonstration and what moved through them in the weeks afterwards lets you show that connection, which is what secures a willing host next season and a better location than the one nobody else wanted.