You can use an audience trigger to fire an event for threshold parameters. You can also use audience trigger events as proxies for more complex conversions. For example: If the condition of your custom audience, let’s say ‘frequent customers’, defines the users who are purchasing more than five products in a month, then each time a user meets that condition and becomes an audience member, you can trigger an event like ‘new_frequent_customer’. In this case, your audience condition will be somewhat like below • Event: purchase • Parameter: event_count • Parameter condition: > 5 in any 30-day period