In response to your letters, I was happy to read about the Farbrengens that you organized for י''ט כסלו, and that you explained to the students the story of the יום טוב. 

It would be good that on such occasions, a few of the students  should also speak at the Farbrengen in order to make them more involved.

Although most of the time they will need help in preparing the speech, there will be some part of the preparation that will be theirs too (which increases their involvement). In addition just the fact that they are speaking is of much value for them.

(From a letter of the Rebbe on  ד' טבת תשט''ו)