When does the giant door behind the bounty tracker open?

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In destiny, when does the giant door in the tower behind the bounty tracker open? I have been told it is during events, but I have never seen it open before
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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Mo Eid, Harrison Haines, Pixabay, Ketut Subiyanto