how do I fix this?

import.php: Missing parameter: import_type (FAQ 2.8)
import.php: Missing parameter: format (FAQ 2.8)

using this sql:
ALTER TABLE `customer_event`
ADD CONSTRAINT `event_id__FK`
Foreign Key (`event_id`) REFERENCES event(`event-id`)

Greetings,

The error probably has nothing to do with the db structure and more to do with a missing parameter that the file 'import.php' is expecting but was not supplied. At a guess I'd check out the FAQ for the package you're using and read section 2.8 ;)