Op, it happens naturally without your effort OR it doesn't happen for the right reasons.

Wrong reasons include:
Absent Parents
The family with the most strict parents who don't let their kids go anywhere else

We have a great hang out house but two very introverted and non social kids so it’s just about the house.

Nothing at our house is particularly awesome. We are the fun house because I let my kid invite about 20 kids over every eight weeks or so. I put folding tables and chairs in the garage and order cheap dominos pizza. They have a blast running around and shrieking. I’m not absent, but I certainly let them shriek.