We have an active seminar, which typically meets at 3pm on thursdays. The seminar schedule, and archive of past talks since Fall 2012, is easily searchable by clicking on the links in the right hand toolbar.
We also occasionally have ergodic and dynamical visitors to speak at the department colloquium. Some recent relevant talks are collected here:
https://u.osu.edu/ergodictheory/category/department-colloquium-with-ergodic-and-dynamical-speakers/
The schedule for all OSU math department events is: