# Audience joined & left events When a user joins or leaves an audience, the Loyalty Engine can be configured to report an `AUDIENCE_JOINED` or `AUDIENCE_LEFT` event to your event stream. These events allow you to create reactors that trigger based on changes in audience membership. > #### Example > > Imagine you have an audience that includes all users who have made 5 purchases within a month. When a user meets this criteria and joins the audience, an `AUDIENCE_JOINED` event could trigger a reactor to award 100 points. For more ideas on how to use these event types, check out our [Create reactors for joining or leaving an audience](/product/loyalty-engine/audiences/audience-tutorials/create-reactors-for-joining-or-leaving-an-audience.md) tutorial. {% hint style="info" %} These event types will only appear in your event type list once you’ve created an audience in your loyalty tenant with the option to report join and leave events enabled. {% endhint %} *** ## Enabling audience joined & left events for an audience Audience joined and left events are enabled on a per-audience basis. To activate this feature, simply enable it in the configuration settings for the specific audience.

Audience joined & left events can be found in the create and edit audience screens of the Loyalty Console

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