Demonstrators said they were intending to march on Goodluck Jonathan's presidential villa in the capital,
Abuja, to maintain pressure on the embattled head of state to secure the girls' safe release.
"It is the wish of this movement that this engagement will catalyse positive action towards (the) quick rescue of our abducted girls," the #BringBackOurGirls campaign coordinator, Hadiza Bala Usman, said in a statement.
Previous street protests in Abuja have led to meetings with lawmakers at the national parliament, Nigeria's national security adviser and military top brass.
Thursday's planned march comes after US President Barack Obama announced that 80 military personnel had been deployed to Chad to help find the 223 girls still missing since their abduction on April 14.
Obama said in a letter to Congress that the military contingent would stay in Chad until their support in ending the crisis that has triggered worldwide outrage "is no longer required".
"These personnel will support the operation of intelligence, surveillance and reconnaissance aircraft for missions over northern Nigeria and the surrounding area," he wrote.
- Schools shut -
The deployment marks a significant boost to an existing US military effort which includes the use of surveillance drones as well as manned aircraft over Nigeria.
The Pentagon has criticised Nigeria for failing to react quickly enough to the rise of Boko Haram, who have been blamed for thousands of deaths since 2009.
Jonathan's administration had previously resisted close cooperation with the West but accepted help from US, British, French and Israeli specialists amid a groundswell of pressure fuelled by a social media campaign.
Nigeria is hoping to tighten the screws on Boko Haram and has asked the United Nations Security Council to proscribe the group, which is said to have links to Al-Qaeda-linked militants in north Africa.
President Jonathan has called the extremists "Al-Qaeda in western and central Africa", underlining what Nigeria views as Boko Haram's threat to regional stability.
The United States and a number of other countries have already designated Boko Haram as a terrorist organisation in an attempt to cut off any international support and overseas funding for the group.
The Nigerian Union of Teachers (NUT) meanwhile called for schools across the country to shut to allow a "day of protest" against the abduction of the girls from Chibok on April 14.
"We remain resolute in our resolve to continue the campaign… until our girls are brought back safe and alive and the perpetrators of the heinous crime are brought to book," NUT president Michael Alogba Olukoya said on Wednesday.
- No let-up -
In the last five weeks, Boko Haram has stepped up its campaign of attacks outside the northeast worst affected by the insurgency, leading to fears of an escalation of violence across the country.
Hours before the girls' kidnapping, the group bombed a crowded busy station in the Abuja suburb of Nyanya, killing 75. A copy-cat bombing at the same location on May 1 left 19 dead.
On Tuesday, two car bombs ripped through a busy market within 20 minutes of each other in the central city of Jos, killing at least 118.
There are fears that the death toll could rise further. The bombing — Nigeria's deadliest — was seen by experts as an indication of Boko Haram's intent to export violence and demonstrate their capability to the international community.
"They have sleeper cells all over the northern part of the country and they're activating them," said Kyari Mohammed, a Boko Haram specialist and chairman of the Centre for Peace Studies at Nigeria's Modibbo Adama University.
"That's what they're going to do. We should anticipate more attacks, especially if they (the government and the international community) are unable to solve the Chibok problem," he told AFP.
At the same time, there has been no let-up in the bloodshed in Borno state, one of three in the northeast which has been under a state of emergency since May last year.
More than 50 people were killed in three separate attacks this week. Two were near Chibok on Monday and Tuesday, while the third was near Gamboru Ngala, close to Lake Chad, where a reported 300 people were killed last month.
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