I really like your plans for the weekend, I personally think doing something like this will show your W you're doing your own thing....and not wallowing in misery like she thinks you should be (even if you are don't show it).
If she questions you about it....just tell her the truth, you didn't know what her plans were and didn't know if she'd be around considering she doesn't show/call when she says she will...but you'd like it if she would stay and have fun.
Sounds like an awful lot of fun...my H and I enjoy dinner parties
