It has been so much fun thinking about this, and reading everyone's answers.
I spent half of my childhood in MI where I remember playing outside ALL day long in the summer. I'd wake up, eat breakfast, and my mom would quickly braid my hair while 5-7 neighborhood kids would be waiting for me on the front porch. We'd run the neighborhood. I'd play til lunch, and then again til dinner, and again until it started getting dark. Then I knew I'd have to race home.
I remember the 4th of July picnics at my grandma's house, then we'd all head up to the town's high school and watch the fireworks.
I didn't see my cousins often because they lived out of state, but when they were at my grandma's we'd all walk up town with just my Grandma while the moms stayed home and relaxed.
When we moved to IL when I was 8, and things were a lot different for me. There were no kids my age to play with in my neighborhood. We had no family here. Our holidays were just the 4 us, and then when I was 13, my brother died so it was just the 3 of us and super lonely.
I remember being in the house a lot watching TV. In the summer, my mom would let me and my brother walk up to the local pool by ourselves. We had a pool pass sewn on to our swimsuits. I played soccer for the park district, and I remember they had a chuck wagon that sold hot dogs, and we'd get one after our games.
As for birthday parties, yes, they were almost always at home and they were small. I didn't know any different and thought it was great.
My kids are having quite a different experience. They have never been able to run free in the neighborhood because it's not safe. They have planned and structured playdates. We have big family holidays and they have cousins to grow up with. Almost all of their birthday parties are at a venue.
I wish things could be simpler for them. I hate that they can't just go out and play like I did, and that so much of their lives are micromanaged. I hate the technological devices and the worries and policing that does along with that.