I actually was able to meet with several faculty members during my visit to UIowa in March of 2010. Maybe it was because the application season had just wrapped up, so they had extra time, or maybe they're just accommodating? Off the top of my head, I met five "big names," plus the clinic director and I was able to sit in on a Pro-Sem (weekly seminar of Speech and Hearing type topics) talk. I would have met Dr. Bentler that time, too, except she was in Paris. I think what it comes down to is announcing your interest in meeting with people one-on-one and calling/emailing with enough time for them to set up meetings and figure out schedules and such. Good luck!