Hey friend, I hear ya on the making things easy for them deal. I have made it extremely easy for my h to stay in the house for a lonnngggg time. Dont know still if that was the right thing. One suggestion, try to makea few less phone calls, maybe wait and combine all the info into one or two, ya know?
As far as ow, I know that she cant even shine my shoes or hold a candle to me, so I try really hard not to give her too much head space. And luckily for you,your kids are old enough to see the truth. Let her hang herself. And she will - you know that.
Keep being your wonderful self. Hold your head high, be there for your children. Live your life.
Have a ball this weekend. And dont think your h wont have a thought or two about you all being up there because he will. But that is not your concern right now. Just have fun!