The key period will be about 3 weeks from opening. Most people who are going to get sick, start to notice symptoms in about a week. And it takes another couple weeks, maybe a bit more, for them to feel sick enough to go to a hospital.
Also, in areas which are currently low infection, it takes a while to build up and spread. Look back at the new stories and counts in mid-March forward.
Any kid peeing in a pool will be under house arrest