If you don't "feel" like going to party and will be not able to act like everything is "ok" then dont force yourself to go.
D14 not answering her phone would drive me insane, I would not stop by, maybe call your W cell phone to ask about D14, but know that this will probably upset your W.
Me 43 ring off Oct 2014 (my ring back on Feb 2015) H 51 (ring off 7/2013) M 2007 T 1996 S 14 July 2013- H told me he was unhappy.....said he is staying for Son Feb 18 2014 Found out about OW