The incidents happened in Jubilee Square on Sunday 11 July 2021 following the Euro 2020 final, during which a car was allegedly damaged and nine officers at the scene reported being assaulted.
Two days later, Kent Police issued an appeal for information containing images of people who it was believed may be able to assist the investigation.
On Friday 16 July, two men and a teenage boy separately presented themselves at Maidstone police station and were arrested on suspicion of violent disorder.
On the same day, another man was arrested in Eltham, Greater London on suspicion of violent disorder, assaulting an emergency worker and outraging public decency.
Four men and three teenage boys who were detained between 11 and 15 July in connection with the incidents have been bailed pending further investigation.
Detectives are continuing to appeal for information and are asking anyone with CCTV, dashcam or phone footage of Jubilee Square, between 11pm and midnight, to contact 01622 604100, quoting crime reference number 46/122441/21.
You can also contact the independent charity Crimestoppers anonymously by calling 0800 555111 or using the anonymous online form on their website.