Say you built a recommendation engine that would recommend you live TV shows for you to watch. For regular shows, you could do a pretty good job using collaborative filtering and the like. But say it was something like the 1969 moon landing. It's obviously an important event, you want your recommendation engine to handle that case. But you also can't rely on past behavior since the value of that recommendation drops to zero once the show is over.
What are some effective methods to deal with this problem in the recommendation space?