Why does how an experience ends shape your whole memory of it?
You remember an experience by its most intense moment and its ending, not its average.
When we look back on an experience, we don't average all the moments - we mostly recall the most intense moment (the peak) and how it ended. A painful medical procedure rated as less unpleasant if it ended with mild discomfort rather than sharp pain - even if the mild ending made it last longer.
A vacation with one magical day and a smooth goodbye beats a steadily pleasant trip that ended in airport chaos.
End well and peak memorably: those two moments define how the whole experience is remembered.
Design the high point and the finish of any event - those two moments become the whole memory.
Peak plus end equals the memory.
Learn the idea and practice English at the same time.