The landmark comes amid a worsening security crisis in northeastern Nigeria, where Islamists have stepped up deadly attacks since the inauguration of President Muhammadu Buhari, killing more than 1,000 people in three months.
Boko Haram fighters stormed the Government Secondary School in the remote town of Chibok in Borno state on the evening of April 14 last year, seizing 276 girls who were preparing for end-of-year exams.
Fifty-seven escaped but nothing has been heard of the 219 others since May last year, when about 100 of them appeared in a Boko Haram video, dressed in Muslim attire and reciting the Koran.
The Bring Back Our Girls social media and protest campaign has announced a youth march in the capital Abuja to mark the grim anniversary along with an evening candle-lit vigil.
Spokeswoman Aisha Yesufu said she was hopeful that the "right thing will be done" under the new regime of Buhari, who replaced Goodluck Jonathan on May 29, vowing to crush Boko Haram.
"We have a new government. Yes, we have seen the kind of things he has done, his body language, what he has said about our girls. He has made them an issue," she told AFP.
The mass abduction brought the brutality of the Islamist insurgency unprecedented worldwide attention and prompted a viral social media campaign demanding their release backed by personalities from US First Lady Michelle Obama to the actress Angelina Jolie.
Nigeria's government was criticised for its initial response to the crisis and Western powers, including the US, have offered logistical and military support to Nigeria's rescue effort, but there have been few signs of progress so far.