Erm, I'm just a bit concerned about the dog being confined to a crate all day! They're supposed to be a sanctuary not a prison. If you feel hard done by just think how you'd feel if you were seriously ill and then found yourself thrown into jail!
As far as the people are concerned, they're being invited into your home for a, hopefully, happy family day. If any of the adults start any upset just tell them to either be nice or go home. If the kids start, read them the riot act then send them outside to run off their surplus energy or if you don't have a garden get everyone playing together in the traditional way and have a laugh.
If all else fails retreat into your bedroom with a tipple and lie down, relax and know that everything passes.
As stated previously many people would willingly change places with you.