My mom started homeschooling us in 1994 and even back then the nearby homeschool groups were all somewhat structured. There were no weekly co-ops in the area until I hit high school several years later, but the homeschool groups were always a monthly gathering with some sort of theme/activity all planned out. I don't remember any park days, even back then. Now that I have young children I can't find anything like the homeschool groups from back then, just co-ops and I'm not the least bit interested in any of them. I don't know many homeschoolers with time to just hang out at a park, their lives are very full.