Xur doesn't arrive until the daily reset on Friday.
He follows the Flashpoint except for DLC planets in which case he'll be on the tower. There will be a symbol for him on the map making him easy to find.
So stop asking where he is.
Bump this post every Friday until everyone gets it.
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I wish Xur would say "what are you buyin'?" or "what are you sellin'?" Too bad we can't sell stuff.