This is one of the many limitations of the Airtable calendars.
Airtable calendars will only display the primary field, so you’ll need to use something else as your primary field — perhaps a formula field that combines the date + other criteria.
Also be sure to email firstname.lastname@example.org about improving their calendar. They don’t monitor the forums here, so they need to hear from you at their support email address. This is a longtime complaint that they have never addressed.