Apparently Faction Rallies are a reoccurring thing but does anyone know if Faction vendors come and go? I'd assume they are permanent but you never know. Bungie might give them a reason to stay then leave etc
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Might be a monthly event, like Iron Banner. Not 100% sure.
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I can't imagine they would come and go seeing as they are vendors that use faction tokens as currency. So I doubt they would disappear and reappear somewhere each week. The only NPC that I know to do that is Xur. But as the comment before me said, I don't know for sure. And right now, I don't think anyone does.
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Seeing that no one has answered you I will to the best of my ability. In short the answer is idk. Honestly I don't think anyone knows because it's so new right now.