This type of group is more likely to have a wide array of events and activities, even ceremonies. Activities that require higher degrees of coordination, like geography or spelling bees, scout troops or 4-H, are more likely to grow out of these larger groups. A newsletter and probably a website are sure to be available. In addition to the above, there is every conceivable combination therein. There are even support groups that are extensions of charter schools and independent study programs.
Every group is as unique as the members of which it is comprised and an entity unto itself.
We know this to be true of any group or club, not just homeschool groups. Some people really do not like large, highly structured groups. Others enjoy the plethora of creative events and activity options that emerge from larger groups. Homeschoolers who enjoy the challenge of advocating homeschooling in political arenas may well enjoy the clout and backing they can garner from a large, highly visible support group. Someone with small children, new to homeschooling, and a bit overwhelmed by the prospect, may prefer a weekly afternoon at the park to field trips and monthly group meetings with speakers.