The quinceanera (aka 'quinces') is a genuine, traditional celebration in Hispanic culture in the Americas and Spanish Caribbean. I've attended a few that were thrown by parents of my DDs' friends for their daughters.
They are much more than "just birthday parties" - they are traditionally a rite of passage into womanhood.
All of the events I've been to involved a court of young men and women alongside the quinceanera herself, rental of a party space, limos, bands, very fancy cake, catered food, formal dress, speeches, and formal dancing.
Some of the more extravagant ones involve party planners, party themes, professional photographers, videographers, and dancing lessons ahead of the event for the young men and women of the court, the quinceanera herself, and her father. Occasionally, the formal dancing will be professionally choreographed.
The ones I've been to ranged from buffet style dining to table service and a menu, but they all featured a father-daughter dance. One of my DDs was once a member of a 'court' and wore a huge, pouffy princess style dress in shocking pink, and heels (rented for the occasion).
The traditions I observed came from Puerto Rican, Mexican, and Cuban families - each one had its own spin on the central theme. For some of the families, the event starts with a Mass. One of the quinces I attended featured a ceremonial presentation and donning of high heels and another had a presentation of a tiara to the girl.
Sweet Sixteens used to have similar traditions (formal wear, lavish meals, special candles, speeches, formal dancing) but they tend to just be informal parties now.
......
The huffing about American culture is predictable and amusing.