When you speak in a(n) style you carefully organize and practice your speech in advance, but deliver it only using minimal notes. manuscript impromptu extemporaneous memorized?

I believe the answer is Extemporaneous Speeches
Extemporaneous Speeches is the combinaton of impromptu and manuscript speeches.
The script that the speaker held during speech delivery only consist of several important points and the speaker will improvise each spoken sentenced based on that points

There is lots of evidence