If you are interested in a career in endocrinology, there are a number of general and subspecialty societies, all of which have annual meetings. Many societies offer opportunities at the annual meetings for fellows-in-training and residents. The following list includes links to useful resources and relevant subspecialty pages where you can find dates for conferences and local/regional chapter meetings:
American Diabetes Association (ADA): They offer a special program for fellows (open to residents also) at the annual meeting.
The Society of Endocrinology offers career profiles with information on fellowships and lifestyle.