Uh-oh. Looks like the Denver stop of this year's Riot Fest may not happen. The annual music festival -- which is taking place in Toronto, Chicago and (maybe) Denver -- has run into some trouble with a permit.

According to the Denver Post, Arapahoe County -- the region that was supposed to host the festival -- has denied Riot Fest the temporary-use permit required to stage the three-day music festival.

The means artists like the Flaming Lips, the Cure, Weezer and the National may not be playing in Denver on Sept. 19-21.

Turns out that county officials are now worried about the estimated 17,000 people that will descend upon the town of Byers in which the actual fest is held -- a town that boats a population of 1,000.

The paper reports that the denial, penned and filed by Arapahoe County zoning administrator Tammy King, was issued because the tiny town felt "a general sense of being overrun with traffic and people" during last year's festival.

"These impacts included residents having difficulty in getting their vehicles in and out of their driveways, substantial difficulties in traveling to obtain groceries and other essential services, difficulty in getting to and from work, [and] difficulty in conducting farm trucking activities," King wrote.

The fest has 10 days to appeal the decision, but so so far has not commented on the situation.

The Riot Fest & Expo at Downsview Park in Toronto runs Sept. 6-7, with the following weekend's Riot Fest & Carnival stopping at Humboldt Park in Chicago. The 10th-anniversary edition of the fest, in addition to featuring a similar lineup at all three dates, also includes some special full-album sets by select artists.

UPDATE: According to the Riot Fest Facebook page, they're going to move the festival to another location. Details will be announced sometime next week.

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