I had a client tonight say that the program I brought to their conference was the best ever (this was their seventh year) because they could tell I deviated from my "planned performance" to meet the needs of the audience. You can do this when you have...
1. An understanding of what an audience looks like when they need a change
2. An understanding of the timing it takes to make the shift successfully
3. Enough material to have a replacement pool to pull from
All three of these things come from just being out there speaking and from watching and learning from people who are great at it!