When you delete a Contact, it's associated Campaign Member record is deleted as well.

An administrator needs to create a one-to-many relationship between two objects with limited access to child records.
What type of field should the administrator use?

In order to implement more business process multiple record types must also be implemented:

DreamHouse Realty requires that house showings be scheduled within the current year to prevent too many future showings from stacking up.
How can they make sure Showing Date is only populated with a date this years?

When you delete a case: