The Diamondback made contact this week with 51 of the students listed. Of those, 33 people said they did not sign the petition.
PSA launched a petition and set of demands in late August.
The petitions call to lower mandatory fees.
Thousands have signed on, joining the call begun by a doctoral student.
Protesters in Maryland joined others in state capitals such as Austin, Texas, and Carson City, Nevada.
Membership "grew exponentially," with over 270 members, the group's founder said.
The University of Maryland cancelled in-person commencement due to the novel coronavirus pandemic.
So far, a petition supporting the cause has garnered over 450 signatures.
Dining Services received a $150,000 grant last spring that allowed them to make the transition.
Only two sign language courses are being offered this semester.