That is a fantastic idea !!!
The one thing I did get into was baby gym, its only an hour a week - but we have so much fun. It is amazing what you can do with a baby, admittedly, it gets even better when they can crawl. Here are a few fun things we do at gym, most I have adopted at home too. I'm not sure if its what you were after, but thought I'd reply any-way as its great fun for me and DD:
1. Bubble time - 'Mooses Bubbles Smel'ems' brand is great as comes in yummy flavours. Its great for co-ordination as DD tracks the bubbles with her eyes and reaches out to touch them. It is amazing how they are totally fascinated by it - great fun. If DD is ever upset or cranky, I get the bubble mixture out and instantly she stops.
2. Story time - any simple kids book with lots of colours, not too many words per page. I never thought DD could sit and listen to a story, yet all the babies do. The facilitator is very animated though, having eye contact with each baby in turn and making actions and sounds. I find myself totally engrossed in the story too.
3. Music time - we do a variety of songs with actions. Some that come to mind is Humpty Dumpty where you sit the baby on your knee bouncing gently, they put them on the floor when Humpty falls. Scarecrow, where you hold or stand bubs up when 'up jumps the scarecrow' - then wiggle arms and legs. Oh, another one I just remembered is each baby having a different noisy toy (like a toy instrument), for example, you bang the drum to the music - then stop the music, hand the instrument around, start it again. That one is good for teaching them to share and let go of toys. There is so many more, we do about 4 different ones each week.
4. Gym time - depends on the babies abilities. There is things you can do when they are just laying down and obviously more things when they can crawl. There is a variety of equipment, soft mini-trampolines they can lay on and gently be bounced, exercize balls to sit them on and gently bounce, little slippery dips to roll them down.
5. Ball time - a variety of balls (size, colour, textures etc) that we roll around, let the babies push them, hold them etc.
6. Parachute time - this is amazing. Its a big colourful soft circle - like a small parachute, with handles around the edge for mums to hold. We sit in a circle with the babies in the middle or just in front of us, laying or sitting (what ever they can do). We have some soft classical music and swish the parachute up and down. We kind of play peekaboo as you will see your baby as the parachute is up, then when you swish it down (slowly) they are under it for a couple of seconds. They seem to love to watch the movement and colours as well as giggling at the peekaboo.
I think that will do for now, there is other things, just can't seem to remember them. I think you are onto some-thing big here. It could be more than just activities, as a place for mums to go for a chat too. I think it would be great to have two parts, like a newborn bit and a toddler bit - a separate thing or area for older kiddies.
Good on you !!!
DD is 3yr 8 months - DS is 6 months