Tens of thousands of people have stopped in the streets of Frankfurt to protest against the far-right Alternative for Germany (AfD) party.
Police said about 35,000 people took part in the protest under the slogan "Defend Democracy."
The protest was held in the centre of Frankfurt, which is known as Germany's financial capital.
A police spokesman described the atmosphere as peaceful.
Protests like this one have been held in several other cities, and they enjoy the support of the state's chancellor, Olaf Scholz.
On Saturday, a similar protest was reported in Limburg, and that the number was greater than expected - 2,800.
The protests were prompted by a report by the Correctiv platform, which said AfD politicians held a meeting with far-right extremists in Potsdam.
Members of the conservative Democratic Union, the largest opposition party, also attended the meeting.
At the meeting in Potsdam, right-wing extremists discussed topics such as "reimgration" – a term used by far-right circles as a euphemism for deporting migrants and minorities.
In a friday appearance, Scholz called the reemedy an "attack on our democracy."
He has welcomed the planned weekend protests.
"I make it very clear that right-wing extremists are attacking our democracy," he said.
Tens of thousands of people are expected to take part in similar protests to be held in German cities.