Well the nature of entertainment is so wide and varied that it seems necessary to ask what you mean by entertainment?
The Fathers do have things to say about various forms of entertainment, but are you talking about TV, or Night-Clubs, or walking in the countryside, or reading, or playing football?
One of the Fathers does remark on the fact that there is a need even for those living in the desert to have some periods of relaxation. Byt of course there are forms of entertainment which are criticised. So it would help if you could elaborate your question a little.