Final answer:
To pull contact fields into the custom report, the admin should create a joined report or custom report type and link the custom object event and contact record using the lookup field. Then, select the desired contact fields as columns in the report.
Step-by-step explanation:
To pull contact fields into the custom report, the administrator should create a joined report or a custom report type. This will allow them to include fields from both the custom object event and the associated contact record. In the joined report, they can link the custom object event and the contact record using the lookup field. Once the report is created, they can then select the desired contact fields as columns in the report.