Debutante balls were all the rage 50 years ago. Traditionally a Debutante is a young lady who has reached the age of maturity and, as a new adult, is introduced to society at a formal "debut" presentation. They became charity events where tickets are sold to raise money.
The Elizabeth Football Club organised Debutante balls, where young ladies were presented to Sir and Lady Lyell McEwin. Money raised went to the club, who provided food and drink on the occasion. An evening of dancing would follow the formal presentation.
Below is a copy of the certificate of Miss O'Shaughnessy who made her debut in 1958, aged only 16. She can be seen far on the left in the photograph.