Sussex Police are braced for their busiest weekend of public order events “in recent memory” as activists’ plans clash with Diamond Jubilee celebrations.

Anti-cuts group Brighton Uncut has become the latest to announce an event on the first weekend of June – when a four-day public holiday is taking place to mark 60 years of the Queen’s reign.

Police have cancelled leave as they prepare for two Fatboy Slim concerts, a gathering of nationalist activists, an anti-war march and more than 60 street parties.

Brighton Uncut this week announced a “community spirit uncut” protest at the Clock Tower in Queen’s Road, Brighton, at noon on Saturday, June 2.

Its previous demonstrations have triggered policing operations involving scores of officers.

A statement from the group said the event would include “tea, cake and conversation, music and games, bunting and traditional gingham table cloths in interesting places”.

It is taking 1948 as its theme – to mark the last time an Olympics was held at a time of national debt, when the NHS and welfare state were created.

Nationalists have used the internet to gather support for an event in Brighton and Hove on the same day – in response to the overwhelming opposition from anti-fascists faced by the March For England last month.

More than 160 people have indicated on social networking website Facebook that they will attend. The English Defence League has previously denied organising the event.

But the “EDL South East Regional” Facebook page carries a notice that an event in Rochdale will be postponed so supporters can go to an unknown location in Brighton for a “peaceful gathering”.

The event details read: “Please note this is not a demo, or a march, and colours are not to be worn.”

That night, and the previous night, Fatboy Slim is playing concerts at the American Express Community Stadium at Falmer.

On Sunday June 3, anti-war group Smash Edo is holding a march from North Street to Hove Town Hall as part of its “summer of resistance”.

Brighton and Hove City Council had received more than 65 applications for street parties over the holiday by the end of last week.

Sussex Police have confirmed they are prepared to draft in officers from other forces if necessary. The city’s divisional commander, Chief Superintendent Graham Bartlett, said: “I don’t think we have seen that number of events in such a short period of time in my recent memory.

“We will provide whatever policing is required. It is not unusual to bring in police from other forces – we did that for March for England.

“Our aim across all of the weekend is to allow people to have peaceful protests but also allow the rest of the city to function as it should on a bank holiday weekend.”

Mark White, local representative of the Police Federation, said the need to cancel leave showed the impact cuts on policing has had.

He said: “I think it is the beginning of feeling the pinch of police cuts.”