More than 20 Ukrainian and other refugees will wave national flags when they take part in a procession to celebrate the UK’s newest city.
Colchester will officially become a city on 23 November when a letters patent, written on parchment paper, will be presented to the mayor.
The parade will start at the Mercury Theatre and end at the Town Hall.
The town was granted city status as part of Queen Elizabeth II’s Platinum Jubilee celebrations.
The commemorations were postponed in September because of the Queen’s death.