As the 12th anniversary of Sept. 11, 2001, nears, a campaign is getting under way to help build awareness for the memorial museum devoted to what happened that day at the World Trade Center.

Work continues on the National September 11 Memorial and Museum at the ground zero site and it remains on track to open next spring, officials say. The project had been delayed by the effects of Hurricane Sandy as well as a dispute between the museum and the owner of the site, the Port Authority of New York and New Jersey.

The campaign carries the theme “Take a day to remember the day that changed us forever.” There will be video clips; print, digital and outdoor advertisements; and an extensive presence in social media like Facebook, Google Plus, Pinterest and Instagram. The campaign’s presence can also be found on Twitter and YouTube....