Demonstration

Demonstration - (noun)

Definition

(1) The act of showing how something is done. (2) A demonstration (or ‘demo’) is when a group of people march or stand together to show they are strongly for or against something.

Extra

Source: Adapted from Cambridge English Dictionary
Example of Use: (1) The demonstration of the new product took place yesterday. (2) Demonstrations against austerity measures were held in many capital cities.