The next NYU Tax Policy Colloquium will be held on Tuesdays from 4 to 6 pm during the spring semester (as they laughingly, or perhaps wistfully, call it here despite how early it starts), which runs from January 22 through April 30, 2019.
But we will then be changing things up, perhaps permanently, by switching to the fall semester. Our current plan is to hold the 2019-20 colloquium in the fall semester - late August through early December 2019, in lieu of our holding it in "spring" 2020. This will then become a permanent scheduling feature unless we get too much of an enrollment hit from the switch. (It's possible that we'll learn more students are able to fit it into their schedules in the spring than the fall semester, and if so we may have to reconsider.)