The ATLAS experiment at CERN has approached outreach and engaging the public in many different ways.
This link is to their home page: http://atlas.ch
For grades 2-8 educational outreach: http://www.quarked.org/about/outreach.html
Or their student/teacher link: http://www.atlas.ch/students-teachers.html
For general public outreach: https://atlasphysathome.web.cern.ch

Check out the latest edition of Smart Puppy!
http://www.ucsd.tv/smart-puppy/

Exploratorium – A science museum in San Francisco, CA that has local and global outreach projects
http://www.exploratorium.edu

IOP Physics.org
http://www.physics.org

Minute Physics
https://www.youtube.com/playlist?list=PL908547EAA7E4AE74

APS Physics Central:
Physics in Action, Physics in Pictures, Physics +, Physics@Home, and more
http://www.physicscentral.com

OSA’s Optics for Kids website:
Activities, Celebrities, Timelines, and more
http://www.optics4kids.org/home/

International Year of Light 2015:
Why light matters, Learn about light, Hands on involvement, and more
http://www.light2015.org/Home.html

Florida State University Magnet Lab:
Interactive Tutorials, Timelines, Pioneers, and more
http://www.magnet.fsu.edu/education/