Yellen will speak at the top of the hour, or just afterwards
The event will start at 2000 GMT (4 pm ET) or within 15 minutes afterwards. The Fed Chair is 'in conversation with Susan M. Collins, dean of the Ford School'.
Expect some softball questions because of the format but she will also take questions from the audience and Twitter.
I'll be testing different streams and channels for latency but a good place to start is this youtube stream: