Mevani, who is the convener of Rashtriya Dalit Adhikar Manch, had invited Kumar to take part in the Azadi Kooch (Freedom March) here today.
Considerable number of Dalit activists first gathered at Somnath Chowk here before embarking on the march towards Banaskantha district this afternoon, the police said.
The Mehsana district authorities had cancelled the permission granted earlier to Mevani for taking out the march.
"We did not arrest them. They were let go afterwards," an official of the Mehsana 'A' division police station, where the FIR has been lodged, said.
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As per the schedule, 'Freedom March' will end at Dhanera town of Banaskantha district of north Gujarat after one week.
The key agenda of this march is to mount pressure on the Gujarat government to allocate agricultural land to Dalits, so that they can start a new life with dignity, Mevani had announced last month.
"We have been released by police after the FIR was registered against us. We have decided to continue our march. We are planning to reach Unjha by tonight," Parmar told PTI.
While addressing people at Somnath chowk before the march, Kumar, who is facing sedition charges, attacked the BJP governments at the Centre and in Gujarat, claiming that atrocities on Dalits and Muslims have increased under them.
In Una, Dalit youths were paraded and flogged for allegedly skinning a dead cow, an incident that caused nation-wide outrage after its video went viral.