Ok, my copy is at home but I was passing a bookstore and stopped. The culmination of the Red Wedding is on pg.583 as Cat has ber throat cut. The culmination of Joff's wedding is on pg 684. The book is 924 pages long (all pages specific to the printing Im holding. I think mi e at home was over 1000 pages, maybe im misremembering though).

In any event not muc separates the two weddings, maybe 10-15% of the toral pages separates them. Translated to the show that would be 3 episodes, and the RW came in ep9 of last season. Joff's wedding will end either episode 2 or 3, I'm telling you.