Thank you BeeV.
It sure would be hard to miss something like that. On this end, taking into account the temperature, moisture and time of day, I'm seeing 10% of the white bees from 3 days ago. They've cut the hay. It was mostly Queen Ann's lace (Wild Carrots), Red Clover and Fescue. I don't see anything like this, but I'll have to look around.
So far I've only gotten one reply about this from the locals, she has no idea. The meeting is Monday, so maybe I'll get an answer then. In any case, it's no longer a concern, it's progressed to a curiosity.
Thank you everybody for the input. I'll update what I find out.