[PSTUM-list] Motivating grad students

PSTUM-List, This year we have been running a seminar on teaching undergraduate mathematics designed to help our graduate students improve our teaching. The seminar is optional, and attendance has generally been low. I'm wondering if anyone on the list has experience with attendance-optional, math department teaching seminars. What, if anything, have you found particular effective in motivating graduate students to attend? If it helps, here's the seminar's web site: http://abel.math.harvard.edu/preceptor/tums/ Thanks in advance for your help! Derek -- Derek Bruff, Preceptor Department of Mathematics, Harvard University Email: bruff(a)fas.harvard.edu Web: http://www.derekbruff.com/