To predict clashes, is something way over exaggerated. If you look into past & present, Qataris unlike neighboring countries have no history of riots or political opposition. In fact there isn't any known Local Political opponent.
Despite resenting many aspects of cultural changes which the country has witnessed recently, many choose to ignore that it's there.
Many Qataris knows that the World cup would benefit them financially in one way or another(Even die hard conservatives), maybe this would keep them silent.
They might not understand or embrace it, but they would definitely not resist it