Have you thought about turning your Mothers Group into a Playgroup? That's what ours did as the kids were getting too big and mobile for everyone's little houses. We looked around at a few centres in our area and we just started a new group at our preferred time each week. The kids get lots of freeplay inside and outside. They are all nearly 2 now so we are starting to think about more structured things like sitting down to eat morning tea, having set activities like drawing, playdoh, music, etc. It works well for the size of our group