According to Michael Swan Practical English Usage (Oxford), "singular words like family, team, government, which refer to groups of people, can have either singular or plural verb forms and pronouns."
In addition, "plural forms are common when the group is seen as collection of people doing personal things like deciding, hoping, or wanting. Singular forms are more common when the group is seen as an impersonal unit."
So, the sentences given below are both grammatically correct sentences.
(1) There was a large audience in tha hall.
(2) The audience were enjoying the performance.
In (1) audience is seen as a group ("impersonal unit" in Swan's term), while in (2) audience is seen as a collection of people doing pesonal things (in this case each member of the audience is enjoying the performance personally).
I hope I have helped you solve your problem.