About WALS The NIH Director’s Wednesday Afternoon Lecture Series, colloquially known as WALS, is the highest-profile lecture program at the NIH. Lectures are held on most Wednesdays from September through June--note that the 2022-23 series is being held from 2:00 to 3:00 p.m. ET virtually and at Lipsett Amphitheater on the NIH campus. View remotely at https://videocast.nih.gov.