Air Vent has published their seminar schedule for 2020 here http://airvent.com/2020-seminar-schedule . This has always been a very good technical seminar and is a good place to meet local roofers, and others, to discuss other industry happenings as well.
It would be time very well spent.
Thank you so much for sharing the information. I just signed up for the seminar in Lancaster PA. Only one hour from my home.