3rd Friday of the Month, OCA Astrophysics SIG, Heritage Museum
1st Wednesday of the Month, OCA Astroimagers SIG, Digital Media Center
Other fee based conferences are also of interest to amateur astronomers and of course physicist wannabes too. If you get really interested or want to know more about the conference details, just search the associated websites.
May 25-27, International Space Development Conference, Sheraton Gateway Hotel, Los Angeles
June 4-7, American Astronomical Society (AAS)- Summer Meeting, Denver, CO
November 1-4, Nightfall Star Party by Riverside Astronomical Society, Borrego Springs, CA
November 15-18, AAVSO Winter Meeting, Lowell Observatory, Flagstaff, AZ