If you had to vacate while hosting then if I were in your shoes I'd pack up and clear out as much of my belongings as possible, possibly store personal items where guests cannot have easy access. When you say family - does this mean children? Because if there are children, they will be curious about being in someone else's home and might want to go through your things. Even if their parents tell them not to, kids are kids. Another option you could consider is you staying in your house while you host. I'm not sure how many rooms you have and your situation, but you could either temporarily move into a different part of the house (like sleep in your home office?) while you let guests use the bedrooms or vice versa. The family might not want the host there, but there is still some time till August 21st so you might be able to find a smaller group to host that wouldn't mind being in an shared house but private room type listing during that time (like a couple or one parent+one child) This might be less money but also less risk and prep work. Also, depending how it turns out, who knows? You might even want to consider hosting more regularly if you have a spare room 🙂 Good luck~!
