Dozens of white nationalists marched through the University of Virginia campus on Friday night carrying torches while chanting "You will not replace us".
Marchers reportedly clashed with counter protesters at the Rotunda, torches were thrown, and blows were exchanged before police came to break it up.
The judge wrote that Kessler was likely to prevail and granted the injunction.
The Charlottesville Area Transit detours went into effect at 6 p.m. Friday, with all service ending at 8 p.m. Saturday, except for the free trolley.
The American Civil Liberties Union (ACLU) is representing the event's organizer - right-wing blogger Jason Kessler - in a lawsuit filed August 10 against the city of Chartlottesville and City Manager Maurice Jones. Citing safety considerations, they ordered it moved to a park about a mile away.
Saturday's rally is meant to protest the city's scheduled removal of the monument as well as its recent renaming of Lee Park, and Mr. Kessler's attorneys argued Thursday that holding the rally elsewhere would "dilute and alter" the demonstrators' message as well as "substantially undermine" their ability to communicate their cause.
"We are grateful that the court recognized that the First Amendment applies equally to everyone regardless of their views".
We encourage everyone participating to commit to non-violence and peaceful protest.
McAuliffe urged residents who plan to attend - whether in support or opposition of the rally - to make alternative plans. Virginia State Police is leading the Commonwealth's planning and response for these events and will be on the scene in a support capacity before, during and after the planned rally. Numerous individuals coming to Charlottesville tomorrow are doing so in order to express viewpoints many people, including me, find abhorrent.
"It is also the right of every American to deny those ideas more attention than they deserve", said McAuliffe.
What began as a local effort to protect a symbol of white supremacy in Charlottesville, Virginia, has become what may be the largest gathering of "pro-white" demonstrators in the United States for well over a decade at this weekend's "Unite the Right" rally.