Below you will find resources and organizations you can join for professional development:
Toastmasters is an international organization that helps people learn and practice skills for public speaking. You must join and pay dues for at least 6 months, but they are transferrable to clubs in other states and countries. Please see the following websites for details:
Visiting Graduate Student Resources
Leadership and involvement opportunities at the Graduate Student Associationhttp://gsa.ucsd.edu/. Also check with your academic department for other social activities and professional development opportunities.