I'm a high school student but planning to partake in several Physics related societies in College. I also plan to visit at least one Physics conference during my high school career. The only one i've heard of is SPS which is "Society of Physics Students." However, that is only for college but I plan to join it as soon as I am in college. I've heard that American Physical Society holds one annually. Can anyone tell me of some Physics Societies? Also, can anyone note any popular conferences that are held in the US?