I – and I think @poorquentyn? – think that it’ll be done in a parallel to Catelyn calling on the sworn swords of the Riverlands to aid her at the Inn at the Crossroads, with Sansa showing a level of understanding of both the heraldry of the Vale and of Winterfell and Sansa’s life that Alayne wouldn’t have.
Yes, I think Littlefinger will be there, because I think she’ll use that opportunity to denounce Littlefinger.
Agreed wholeheartedly, though credit belongs to @liesandarbor.
Apologies to @liesandarbor for the misremembering; it’s a great theory and you deserve all the credit for it.