The largest, longest is Thursday through Saturday, Sept. 8-11 in Boston. You can attend as a para-professional for $250 and take as many sessions as you'd like. There will be many interesting heart disease, HCM, and nutrition related subjects that layman should be able to follow.
The other shorter conference is in St. Louis, July 16-19. Per the search schedule, Monday, July 18 at 8 a.m., Dr. Meg Sleeper will give a discussion regarding nutrition and HCM. There is a $25 fee for attending the conference as a non-practitioner.