The event is Sunday July 19, hosted on Wikipedia Weekly Network.

Time in select zones:
1:00–3:00 pm (New York City time)
17:00–19:00 UTC/GMT
19:00–21:00 Berlin time

You can participate on the Youtube livestream here, and text chat with the presenters and ask questions, etc:

I also invite you to sign up for a lightning talk, and I will be glad to send interested individuals the on-air link: