Note:
Currently, you can define the event date, event type and context.

To add a new event, do the following:

1. Click Customers > Customer list in the Sidebar.
2. Click the name of the appropriate customer.
   The Customer Details page displays.
3. Click the New event button in the Events Timeline.
   The New event page displays.
4. Enter the event date, event type and context properties, as required.

Depending on the event type, the Customers section also displays all the relevant predefined properties.

A list of events and predefined properties is available from:

http://developer.contactlab.com/hub-json-schemas/

See Creating and managing extended properties and Adding extended properties to events and products for more about extended properties.

Note:
You can only add a new event if you have write access enabled on the relevant node. Any new event creation is tracked in audit logs.