For the last week of the season, I suggest having a "Triple Double Week" (working title) where Crucible, Gambit and Vanguard playlists all have a 2x rank progress booster. This would allow for an easier time grinding for the ritual weapon ornaments for those who haven't done so and is a nice way to send off a season.
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Then the playlists will be empty all season and only fill up on the last week.