Milo Yiannopoulos, Tommy Robinson and other controversial speakers are expected to appear at a rally in London this afternoon.
The so-called Day for Freedom is scheduled to take place in Whitehall at 3pm today.
Other speakers include Lauren Southern, who was detained while attempting to enter the UK in March. Breitbart London editor Raheem Kassam is also billed to appear, alongside Vice co-founder Gavin McInnes and Youtubers Count Dankula and Sargon of Akkad.
Organisers expect about 5,000 people to attend.
Whitehall is closed due to the demonstration, according to the TfL website, with a diversion route in place.
The group is set to be met by counter-protestors. Groups such as the Anti-Fascist Student Network and London Antifascists have issued calls for their supporters to gather in opposition to the event.
A Facebook event for the counter-demonstration said: "We cannot let the far-right march through our city unopposed.
"We must never allow racist and fascist views to take hold anywhere. The more we are, the more we can drown out their nonsense."
Police are in place to "respond to any disorder which may occur".
Read more: UK set to enjoy record-breaking weather over bank holiday weekend
Extra officers are already on duty during the Bank Holiday weekend, with a particular focus on violent crime.
"This ranges from foot patrols and officers carrying out warrants and weapon sweeps to a dedicated central team monitoring fast-time intelligence," said deputy assistant commissioner Graham McNulty. "There will also be plain clothes officers using covert tactics.
"As people start looking forward to a sunny long weekend in London we want everyone to know that the Met is working hard to keep London safe."
Read more: City of London Police to fight cyber crime in Square Mile
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