I don't doubt you'll have strawberry's for the fair, just saying that if the fair is in late August, I wouldn't start them now. I would wait until late May at the earliest to start them (two months from now). The thing with soil born pathogens is you cant clean them off the roots. Even if you clean every speck of soil off, the pathogens will still be on/in the roots. It only takes one infected plant to spread it to all of them in a recirculating
hydroponic system.