You could always poll a few of the women at your church about your craft day plans. Not everyone will be able to attend for one reason or other, obviously, but 10:30 on Fridays sounds good (I'd come!). Even 10:00 would work, I think. Both are certainly early enough not to interfere with nap times.
As for snacks, I say have 'em! And a round-robin sounds like a great idea unless you have someone in the group who loves to bake and needs an excuse. (I say that because my mother is like that; she practically makes up her own holidays as excuses to bake cakes