Contrary to what NBC says here: https://www.nbcumv.com/schedule-network-list?network=33129
(NBC's programming calendar shows American Comedy Awards show for tonight. Sigh.)
8pm will be Stand Up To Cancer
9pm will be hour of Dateline dedicated to Joan Rivers
10pm will be a news special with Kathie Lee and Hoda about "Saving Dr. Brantly."
FYI, Brantly is the American doctor who was flown back to America with Ebola.
ABC had beaten NBC to the punch by announcing their Joan Rivers hour at 10pm very quickly, so 30 Rock was trapped and has to run their hour at 9pm.
While not yet published at APT, these changes have already been made in client inventories.