Brussels police has been enforcing an order to close down the National Conservatism Conference, on Tuesday.
Organisers said the event in the Belgian capital would continue, but guests were no longer allowed to enter.
Local authorities raised concerns over the safety of the public, saying the conference should not go ahead.
The conference aims to bring together right-wing politicians across Europe, including Nigel Farage and Hungarian Prime Minister Viktor Orban.
Former UK Home Secretary Suella Braverman and far-right French politician Eric Zemmour were also listed as keynote speakers.
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