Custom event fields are only available for query through the initiative in which they were entered, unlike Custom Profile Fields which are accessible through a Custom Fields under the Contacts folder.
  1. Navigate to Control>Query
  2. Click New and select All Contacts
  3. Expand Communities
  4. Expand the type of initiative your event/form is, then click Choose Event next to the desired Initiative
  5. Select your Initiative(s) and click OK
  6. Select any other desired input
  7. Click Next
  8. Select the field for output
  9. Click Next to sort or Finish to run