Originally Posted by
lowfareair
You can always be the DP, but I don't see why they would make an exception for overnight flights when they generally haven't during slow times at their other lounges.
Since it sounds like you "might" get stuck, have you considered scanning your old boarding pass and trying that? I'm assuming there is a delay/cxl of some sort rather than you booking an intentional overnight itinerary.
Two recent DPs from IAD and DCA. It seems the IAD C1 lounge has a little flexibility. I was recently allowed in at T-205, but made quite clear it was an exception due to a non busy time. At the DCA 'Landing', I arrived at T-195, and while the agent was very apologetic, and plenty of seats were available, her app simply wouldn't allow entry until T-180.