I really think it is important to socialize a puppy as soon as possible. I do agree in putting them into puppy kindergarden.
But.... and it is a big one....... I would never put a puppy that doesn't have all of its shots in a box store puppy kindergarden.
In other areas of the country that are not having the same problems as you are with parvo (private schools) do let their pups in after having their second shots. In those private schools the owners/instructors make sure that all the dogs that are coming to classes are up to date on all of their shots.
In the box stores anyone can walk in with their dogs which can put your puppy at major risk.
You can do meet and greets with dogs that you know are safe and friendly while waiting for all the shots.
I don't look at puppy kindergarden as important for the pup to meet other dogs but for the owner to learn how to teach their puppy. If you are doing all the other types of socialization (the hundred different people) twelve or more surfaces, having the puppy experience gloves, hats, umbrellas, cars, trucks etc which from another of your posts you are, you are way ahead of many owners.
I think you know how to train a pup/dog.
And if there is something you want to explore differently you have the knowledge right at your fingertips or from those you trust on here.
I remember some of those posts and I believe you shouldn't second guess yourself. In the case of your area Yogi's health and safety comes first. Then you can try and look outside the box to work around things until he has his shots.
And a big congratulations on your baby.