This June, from 6/20 - 6/25, will be the second annual Fitness Professionals Online Summit.
You can sign up for it here:
Fitness Professionals Online Summit
I signed up last year, and although I wasn't able to see all of the presentations, I saw many of them. They were interesting and useful. It was more useful than some paid seminars I attended, as well.
Although it is aimed at fitness professionals, there might be a seminar or two useful to non-fitness professionals, too.