Lincolnshire Police have issued another re-appeal for information on the identities of a number of people who attended the Twyford Woods rave in 2015.
Over a year has passed since the rave near Colsterworth on May 23 and 24, which saw an estimated 1,000 revellers on the site.
Lincolnshire Police carried out an operation to shut down the rave, which resulted in 21 officers and a police dog sustaining injuries.
A number of people have already or are due to appear in court charged with offences in relation to the illegal rave.
However, the force has not yet managed to locate those pictured.
Offences allegedly committed during the event included violent disorder, assault on police, criminal damage, dealing in drugs, failing to stop for police, and failing to abide by direction to leave.
Lincolnshire Police are appealing for help in identifying the individuals shown.
Anyone who knows them should contact the force on 101, quoting incident 137 of September 11, 2015.
Alternatively contact the independent charity Crimestoppers anonymously on 0800 555 111.