I love going to concerts, they're great!\
This is usually a  live music performance in front of a crowd of onlookers
Yes, that's correct. I went to a Plain White Tees one recently!
This can be by one musician or a group , it  might even be a musical ensemble  such as an orchestra, choir, or band.
Oh yes, what else do you know about concerts?
Indoor concerts held in the largest venues  which are usually called Arenas
I see, than what would the smaller venues be held in?
can be anywhere even open spaces, informal names for a concert is called show or gig