UFC president Dana White has been insistent that UFC 249: Khabib vs. Ferguson will move forward on April 18 as scheduled. He did recently however indicate that the event might be on the move, quite possibly to a location outside of the United States.
The reason for that move is that New York, per an ESPN report from Marc Raimondi, has informed the UFC that the event will not be allowed to take place in the state.
New York State Department of State on UFC 249:
"Out of an abundance of caution and in line with recent guidance issued by the Center for Disease Control and New York State, the New York State Athletic Commission informed the UFC that UFC 249 cannot be held in NY."
Earlier this week, White hinted at New York's decision by telling ESPN that he planned for UFC 249 to still happen, but that he might have to take it outside the United States to do so.
UFC 249: Khabib vs. Ferguson will happen, probably outside the United States
“We’ve complied with everything that the government and these doctors have said to do. We have no choice now but to postpone these fights. But Tony Ferguson vs. Khabib, April 18, is still on and that one will happen. We’re going to follow these guidelines to not have more than 10 people in a room and we’re hoping that this all clears up by April. This fight is gonna happen, no crowd, whatever it takes. Probably not even gonna be in the United States, but this fight is gonna happen.”