ANSWER:

What kind of entertainment? 

If you mean music, movies etc, this is not permissible whether during fasting or while not fasting.

Is it permissable to use cell phone for some sort of emtertainment while you are fasting?

Fasting, Sports, Entertainment and Music | May 13, 2019 8:02 am
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Can I combine the intention of making up my previous ramdan missed fast with that of Shawwal or Ashura or fasting on 9 days of dhul hijja or 13,14,15 of each Islamic month,or Monday & Thursday of each week.By expecting to get the reward of both how should I make my intention.

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Is it allowed to watch comedy(just simple comedy,no adult comedy) and does it invalidiate our fast?