Question

a group of people listening to a concert of lectur​

Answer 1

I think you want to know what these people are called.

This group of people is known as audience.

Answer 2

We have to do one word substitution for “a group of people listening to a concert or lecture”.

They are called “audience”.

Examples:

• The audience laughed and he glanced up at the stage.
• This officer's audience lasted a long time.
• The pope frequently received him in private audience.