Police, businesses and residents are gearing up as more protests are expected in Sussex.
Posts being shared on a number of social media platforms suggest both protesters and counter-protesters could clash at several locations across Crawley on Friday evening.
The town council says the reports are unverified, but that it will stand against any racism or abuse.
Read more: Clean-up begins in Brighton after huge counter-protest
Crawley Borough Council leader Cllr Michael Jones, and opposition leader Duncan Crow both signed a letter about tomorrow's rumoured events.
"We have been shocked and saddened to see the violence directed at minority groups and communities over the past week, perpetrated by extremists stirred up by online disinformation and misinformation. There is no justification for this violence; it is simply unacceptable.
"Crawley has not seen the same disorder as other parts of the country. However, we are aware of unverified reports circulating online of potential protests and counter-protests in Crawley.
The council is working closely with Sussex Police, West Sussex County Council and other agencies to provide information and reassurance and to help keep our communities safe. Everyone should be able to go about their daily business and not feel threatened.
"The police have increased patrols in key areas this week and are urging residents speak to officers if you have any questions. To report a crime, call 101. In an emergency, call 999.
"We are a proudly diverse town, where our friends and neighbours come from many different backgrounds, but all come together to make Crawley their home.
"As a council and a town, we stand together against any form of racism, discrimination and abuse. We celebrate Crawley and the people that make it and know that there is far more that unites us than divides us."
It comes after violent protests have been causing destruction across the country since the Southport stabbings which killed three young girls last week.
Demonstrations in Brighton and Hastings on Wednesday evening, however, remained largely peaceful.
Thousands gathered in central Brighton with loud drums and music playing, and signs proclaiming “No to Racism” and “Education is key misinformation kills”.
The Argus has chosen not to publish further details of Friday's potential protest.
Read more: 18 pictures as Brighton avoids riots and thousands counter-protest
Assistant Chief Constable Paul Court has issued a stark warning to those thinking about causing trouble tomorrow evening.
He said: "Anyone planning to take part in criminal disorder in Sussex will regret their actions. Do not do it.
"Our officers are mobilised and fully prepared, and the ramifications for those involved will stretch far beyond the conclusion of any incidents."
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