A fresh start? (probably not!)

[CW2017]

Hi all
not expecting anyone to reacquaint themselves with my sitch as such but instead am asking for any general advice on how to approach certain unpleasant first anniversaries. My first one will be my W having her works Christmas party on exactly the same Friday as last year when she got "acquainted" with OM. And of course BD is coming up on 01/03. The caveat here of course is that we are still living together with a seemingly "normal" life (or at least that's what she thinks I'm thinking!).

thanks in advance