The right of freedom of assembly and petition allows people to do what

The right to freedom allowed any amount of people convene and protest or simply gather in a peaceful, responsible, and sensible manner. While the right to petition allowed the people to proposes changes to laws and suggest entirely new ones at that. Unprecedented laws in the 1700's where states largely decided who got to do what they decided.

The 1st amendment in the Bill of Rights gives an American the right of freedom of expression, freedom to petition, freedom of assembly, freedom of religion, and the freedom of speech.

The freedom to assembly basically means that us Americans have the right to hold meetings and express, defend, and pursue their beliefs. The right to petition is that Americans have the right to demand certain things from the government, such as safety and freedom.