When I was that age, things weren't as fun as now. Some of the parties were good, some more serious. I do remember one where the kid's parents were very liberal and well-to-do. They were playing the Rolling Stones, and dancing like at a club. My town was maybe 20% Jewish, which is a lot, but the Italians, Irish, and what-not did a good job of harassing us, so we still felt like outsiders.
Things were much more extravagant when my daughter and her friends and my friend's kids had their bar/bat mitzvahs. It's a bigger thing today.