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Confirmed through Viz's Weekly Shōnen Jump that Chapter 862 will be postponed this week (which is posted as "One Piece will be off next week") so the main part of the wedding event won't occur until the following week.

For something as big as this for the storyline I decided to be observant and check the last page of the chapter figuring that Oda might take a one-week break, which as it turns out was indeed true. Though disappointed, I at least was mentally prepared for this and will be happy to hear what happens in over a week from now.