None of us parents had expected the temperature to be in the 80s, so many of us came to the park unprepared. Not only did we meet up at a park with very little shade, but many of the kids were dressed in long pants and long shirts. Not exactly summer attire.
When we accidentally go to a play date unprepared, we almost always can keep our kids happy if we pool our resources together. Someone forget sunscreen? toys? a diaper? snacks? water? No worries, most of the time one parent has remembered something that another has forgotten.
It can be hard to figure out exactly what to pack in your diaper bag when you leave the house with little ones. You don't want to lug a huge bag of unnecessary stuff that you will never use, but you also don't want to have to leave an enjoyable outing early just because you left something important at home.
It's nice to sometimes lean on the shoulders of friends when you come unprepared to a play date. And it's especially nice when you can immediately return the favor when they are also in need of an extra hand.