When the UFC confirmed middleweight champion Anderson Silva would defend his title against rival Chael Sonnen this summer at a soccer stadium in Brazil the MMA world rejoiced. The bout had dealt with its share of adversity leading up to the announcement including Silva’s health and desire to fight Sonnen a second time, as well as some difficulty in scheduling an arena worthy of the historic rematch. Unfortunately, while signs seemed to be pointing in a positive direction as recently as last week, it appears the card expected to host Silva-Sonnen II is not quite out of the woods yet.

During the post-show for UFC on Fuel 2 it was revealed the organization had encountered an issue with the date attached to UFC 147. Apparently the United Nations has scheduled a major conference in Rio de Janeiro during the days preceding the UFC’s event causing a ton of logistical problems for UFC President Dana White and crew.

“The problem is that first of all they don’t like the idea of us coming at the same time as this United Nations convention is going on. The other problem is hotel rooms. Most of the hotel rooms are being taken up,” said White on the topic.

White added he expects to have a resolution in place later this week whether it means changing the date or location. UFC 147 is expected to be the biggest show in the promotion’s history with more than 70,000 fans expected to attend.