sad kids after youth festival ???

Yes, this is a reported issue. You can click on “me too” on this post here https://answers.ea.com/t5/Bug-Reports/Youth-Festival-Always-Gives-Kids-No-Blessing-Sentiment/m-p/9771513#M164876

Edit: not sure if you meant that they are sad because an adult didn’t bless them, or they were blessed and the feature doesn’t work. If they haven’t been blessed, then being sad would be normal. Just click on the child with an adult active, and you should get the option (only while at the festival).