The race is really well organized and the website is full of information. This year, there had been a lot of rain before so it was a mud slide for 30 of the 50km. I had originally signed up for the 50 mile race and when I went to change my distance a couple weeks before they charged me $20 to change the distance! I agree with charging for transfers or upping your distance but not a downgrade! Besides this hiccup, I highly recommend the race.

There is no expo, you pick up your bib at the North Face store. There is also no swag beside the shirt.
You can read more about it here - https://katherineyager.com/2016/04/13/race-recap-north-face-endurance-challenge-series-dc-50k/