"Rally attendees" refers to the people who go to a gathering or event called a rally, where they support or express their views on a specific cause, idea, or person. Full definition
Mayor de Blasio returned to City Hall shortly before the scheduled start of the NYCLASS rally and greeted some early arriving rally attendees as he passed through City Hall plaza: (newyorktrue.com)
The event ended with rally attendees posing for photos with the politicians, as Deacon staffers quickly began to tear down campaign signs taped to walls and organize supplies. (104.236.62.190)
Meanwhile, Duffy, who told the ESPA rally attendees this morning that people will flee the state if they are «denied a basic civil right» — just like they are departing in the face of ever - increasing property taxes — did not stick around to chat with reporters who were covering the event. (nystateofpolitics.com)