I was rather surprised at today's "tip" encouraging you not to avoid people with chicken pox. I just want to point out that chicken pox is not always very mild. My boys had it last summer, ages 1 and 3, so relatively young - it's supposed to be easier. And they were both utterly miserable, and quite ill, with high fevers etc., for quite some time. We knew we had been exposed, so avoided contact with others before the spots even appeared, and then the illness lasted so long, it felt like it completely wiped out the summer. It was an 'ideal' time for us - we didn't miss any major events or any school or nursery time, but if I had deliberately exposed them at that time I would have felt dreadful at inflicting that upon them.
So you may want to think again before deliberately putting your child through this.