No, the audience is a collective noun which refers to all the people present, so '4000 audiences' implies 4000 separate groups of people.
''There were 4000 *in the audience* at the concert'' is what you are probably trying to say.
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Hey there,
Audience is a plural word which stands for a group of people. You could say "There where 4000 people in the AUDIENCE at the concert."
"4000 audiences" would mean there are 4000 separate groups. This would not be correct.