These "parties" have been going on for at least the past 5 years; perhaps a bit longer. I find them dumb and thankfully, they aren't as universal as one might assume that they they are.
The trannies and queers have "coming out parties", which is a debasement of the use of that term for girls reaching a marriageable age and being "introduced to society".
I love how stanch you are in your defense of your ignorance. Bravo!