ENTRIES ARE STILL AVAILABLE FOR THE NITRO CHALLENGE!!!
i spoke with Joey (from The Dirt), & he said that entries are still available. You just won't be getting a free T shirt with your entry. If you enter, Joey said it will be best to call in, even if its a few days before(i think he even said a day before too but don't quote me on that), as it makes for less paperwork for him on the day.
Brodie.