In 2018, Energy Efficiency Day supporters hosted and participated in events nationwide. See the list of events from 2018:

Arkansas
Arkansas Interfaith Power and Light held two volunteer opportunities during which participants assembled treat bags with energy efficiency items (LED bulbs, power strips, socket sealers and faucet aerators) to help ther Little Rock neighbors reduce their energy consumption and their utility bills.

California

The County of San Luis Obispo Public Works Department held an “Energy Efficiency Day Challenge” for the department’s 300 employees. The challenge required some light research about both County and home energy efficiency related topics and best of all, staff could have their family participate.  
 
Illinois
The Citizens Utility Board (CUB) offered state residents a myth-busting “Energy Quiz” for the chance to win $100 toward their October utility bills, in celebration of Energy Efficiency Day.

Indiana
The Vectren Corporation in Evansville, Indiana celebrated Energy Efficiency Day by encouraging the benefits of energy efficiency as well as providing some fun giveaways for their employees.  

Kansas
The Kansas Energy Program at Kansas State University Engineering Extension hosted the inaugural Kansas Energy Efficiency Expo at the Kansas Statehouse and Capitol Complex.

Louisiana
Xavier University held a “Switch Off” challenge encouraging people to turn off the light and electronics for five minutes. 

Massachusetts
National Grid offered its Massachusetts customers a discount on LED lightbulbs.

New York
Kinetic Communities Consulting facilitated an interactive workshop on energy efficiency and how to expand awareness for an energy-equitable New York. The workshop was at National Grid in Brooklyn. 

Pennsylvania
Conservation Consultants, Inc., hosted a certified passive house tour and happy hour in Pittsburgh. A passive building involves extreme energy efficiency (targeting 60-70% energy use reduction) and performance verification that is proven through an air tightness test with rigorous passing standards.

Rhode Island
National Grid Rhode Island celebrated #EEDay2018 with a one-day sale on Nest thermostats.

Virginia
Henrico County, Virginia held an Energy Fair that was free and open to the public, at the Henrico County Western Government Center.

International
Canada: Energy Efficiency Alberta celebrated Energy Efficiency Day in its lobby in Calgary where visitors could try out an energy-generating bike!

Puerto Rico: The ASHRAE Puerto Rico Chapter, USGBC Puerto Rico Chapter, and the Puerto Rico Energy Efficiency and Sustainability Alliance (PR-EESA), hosted a government outreach day and an Energy Efficiency Day Celebration event at El Capitolio de Puerto Rico.

Online
Environment America hosted a Twitter chat, and @MEEAee released fun, creative energy efficiency content on Twitter.