Giving a Thank You Speech
It is a good idea to have students give a "thank you speech" after a talk by their classmates. The speakers sum up the talk they listened to and comment on what they learned. They are asked to mention the quality of the English during the talk and the interest of the follow-up activity (workshop) that was organized.
To help the students practice for this spontaneous activity we have them work on an oral exercise with the structures they are supposed to use.
On the "QualityTime-ESL DVD" there is even a film showing students giving an oral synthesis/thank you speech.