The usual Spanish plural for two or more girls celebrating their fifteenth-birthday coming-of-age events is quinceañeras.
Quinceañera is a feminine Spanish noun that can identify the honoree or the celebration. Its regular plural is formed by adding -s, producing quinceañeras. The spelling retains the ñ, and the accent mark remains over the a because it preserves the word’s pronunciation and stress pattern.
This language detail matters because quinceañera is often used in English without translation. English speakers may write quinceanera when a keyboard lacks ñ, but quinceañera is the standard Spanish spelling. In Spanish, quinceañeras can therefore refer to multiple honorees or multiple celebrations, depending on context.
Quinceañeros is not the regular plural of quinceañera; it is the masculine plural form related to quinceañero. Some communities hold parallel or adapted celebrations for boys, but those practices should not be treated as identical to the traditional quinceañera. Usage can also vary in bilingual communities.