People are almost always at the center of meetings or seminars (at least I hope they are).
Drawing them can be easy for your notes. Later you can make them as complex as you want to develop your own style.
Make drawing your second language.
Using the dots and lines to create meaningful notes say more to me than writing words. Now as most of you know I write very little and draw a lot. I write with images.
Through the years I have developed a visual vocabulary of my own. I have done this unconsciously. But I soon found out that I have to stick to the meaning of some. Because sometimes the meaning changes in my head. Especially for those projects where I have to gather information to create meaningful designs.