You may have heard about PX Custom Events… but do you know all the places you can use them in PX? Custom events: 

• Can be used as filters, including attributes in Analytics
• Can be mapped to Features and filtered by attribute values
• Are visible in a user's Recent Activity, with a mouseover showing the underlying attributes for the event
• Can be used as criteria in Audience Logic for Engagements, including attributes
• Can be selected and grouped by attributes in Query Builder (image below)