I have been trying to increase the amount of practice students get. Irritatingly, many students get very annoyed when asked to give talks for which they will no

I have been trying to increase the amount of practice students get. Irritatingly, many students get very annoyed when asked to give talks for which they will not be graded, which makes it hard to give students the chance to practice in a risk-free (by which I mean mark-free) environment.