From what I have read in these responses. Is that some of these "pox parties" are done for convenience to the parents.
As not to miss work or even school days.
My youngest daughter had chicken pox over her spring break vacation. She was as spotted as some of the Easter eggs she hunted for in her private egg hunt with Cody. Since both of them had the pox, he spent his week with us.
We had two bathrooms, so his Mom and I gave them oatmeal baths when he was over playing. And went through bottles of calamine lotion.