When finishing my recent graduate course in technology I had the students develop a collaborative presentation reviewing all the various items we discussed. What a great authentic activity. One of the students created a template for the rest of the students in class would then expand upon. Each person picked one topic and then started with the initial slide and added more. During the 2 hour time period the presentation came alive in front of all of them. Then they each had an opportunity to go through and updated/edit each of the slides.
Afterwards we discussed this activity and many agreed they could do this in their classroom. You may wish to try this for any time of activity needing a presentation.