Try finding some place close by, cause finding parking can be a pain, specially when an event is going on. Or take in considration that you might need to use Uber or Lyft.
There is a hyatt and I believe a hilton.
Elizabeth is correct. Both are within walking distance.
If your problem is just parking just be there 1.5 hours before the concert time and I bet you can find very close spot to DAR.
All are a few blocks away. Look for hotels around 17th street and H street intersection in Northwest (NW)
perhaps you can use gwu dormitory
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