Hi Farrell:
Sure, these activities could work. Yet...suppose the VCR or DVD player is non-operational, or anything electronic is unavailable?
My sugesstion usually is to have a discussion topic related to the course, something that can be initiated with little preparation, and still has some significance for your students. Other ideas are to practice past lessons or have the students demonstrate their skills to the class.
Good back up plns are invaluable when they're called into action!
Regards, Barry