What the hell happened in Greenville this year?

Due to a bunch of shit out of my control, i was'nt able to attend the Greenville show last weekend (first time missing it in 4 years, it was the first truck show i ever went to). Now i get on here and hear all this shit about fights and gangs and everyone's pissed, etc. WTF? What happened that was so bad? Someone please clue me in.