I think the OP is poorly worded. It assumes that atheists organize and deliver children's program...for what exactly? The question should've been inquiring if there are religion-free experiences for children and as you can see by the posts on this thread, KS, there are perhaps a majority of religion-free community experiences available.
One thing I wanted to mention is that in our area, there is a group that promotes sound environmental practices and contains a big organic type garden that might actually be a Hugelkultur garden, but I didn't take a moment to check before posting here. It was created for children and they have classes for children for all related topics.
It was developed and is run by one of my former students. 
And that, my friends, is why you take the seeds out of the tomatoes during snack, let them dry, and plant them.
KS find a place to teach your children how to grow food. You may already doing it and if you are, keep it going!
p.s. Check your local Home Depot for classes for young builders. Try Lowes as well. And Hobby Lobby probably still has crafting, needle arts, and sewing classes for children including cake decorating using Wilton's products. Give it a shot! There are also community offerings in my area for cooking classes and food preparation by age. Offer these things to your children regardless of gender. I watch a youtuber whose son absolutely loves to sew and now has his own machine! And remember that sports are religion-free experiences as well!
It’s pretty clear ks’s strategy backfired on him here. He thought his variation on Nelson’s obnoxious “where will you go? What will you do?” might get him somewhere, and it clearly failed.