Both Uses of

demonstrate
in
The Hunger Games

I smooth my hair, set my shoulders back, and walk into the gymnasium. Instantly, I know I'm in trouble. They've been here too long, the Gamemakers. Sat through twenty-three other demonstrations. Had too much to wine, most of them. Want more than anything to go home.
p. 100.9 *

demonstrations = displays

And utterly lacking in the control Foxface demonstrated.
p. 324.7

demonstrated = showed

Definitions:

(1) (demonstrate as in: It demonstrates my point.)
to show
The exact meaning of this sense of demonstrate can depend upon its context. For example:
- "I will demonstrate how to throw a Frisbee." -- show how to do something
- "I will demonstrate how much quicker the new computer is than the old one." -- show how something works
- "Her questioned demonstrated that she was listening and thinking deeply about what was said." -- showed to be true or proved
(2) (demonstrate as in: demonstrate to protest)
a public display supporting a cause -- usually joining with others in a political protest