Very simple - I had no info about investiture nor the real importance of the Night of Fire festival at the beginning of this turn.
What I had on table was urgence from Diem, Medoere and Avanil about when I'm going to fullfill my promise to take lead of the west army - with a little note from DM that ARR is going to keep the promise.
So it was apparent I need to be at two places at once this turn - and the absence in Tornilen seemed to be more excusable. So according to my DO ARR was really first week or so in Tornilen, then moved to Barisen.