NBC will expand its test of the morning show “Talk With Dr. David Viscott” to affiliate KRON-TV in San Francisco starting today for the next month. The one-hour program will air at noon, pre-empting “Faith Daniels” and the syndicated “You Bet Your Life.”“Talk” currently airs on NBC-owned KNBC-TV locally. The Director’s Guild of America will host an event tomorrow to run two short films from its Mentorship program. The films to be shown will be “At Night the Sun Shines,” directed by Guillermo Real, with Robert Wise as his mentor, and “Me & the King,” directed by Melissa Jenkins, with Richard Donner as her mentor. The screenings for both films will be held at 7 and 9 p.m. at the DGA theater.