What is the meaning of call What is the terrain of crazy call?

Calling, a kind of wota art , refers to the spontaneous behavior of the audience on stage during LIVE to follow the rhythm of the music, according to a certain pattern, by shouting, waving glow sticks, etc., to interact with the performers on stage. In Japan, call simply refers to shouting slogans according to the elements in the lyrics of a song during idol LIVE, including linking, repeating and responding to the lyrics.

Calling is a concentrated expression of support and affection for the artist on stage, which may seem crazy but is actually rational, and is mainly reflected in neatly organized shouts and a sea of glow sticks under the stage. Now it is extended to the active atmosphere to make things happen as well as the meaning of cheering for so-and-so.

--From 360 Wikipedia

Nowadays, it can also be extended to the admiration of bigwigs in all walks of life.