In my country, the 2 best time to have chicken pox are:

1. When you are kid - yay, no school.
2. When you are serving in the military - yay, no tough duty.
   BTW, I heard about parents organising chicken pox party in the past.
   Not sure if you guys have it. When a kid has chicken in good timing, some parents send their children to play with the infected child. Get it once and immunity deal. Nowadays, I think there's less of these since there is vaccination.