Five mobile phones were stolen from the Moda Warehouse Party at Lincolnshire Showground on Saturday 19th October.
It is believed an organised gang targeted the event and pick-pocketed several members of the public.
Police say it is not unusual for gigs to be targeted by gangs and officers are urging people to be aware of this and to keep smart phones safe in these environments.
They are also urging people to register their phones’ IMEI numbers on a national database to make it much easier for police to return them if they are recovered.
Dial *#06# to display your IMEI number, then sign up to www.immobilise.com and register the IMEI.
If anyone had their phone stolen at this event and has not yet reported it then please email [email protected] or text 07939 896147.
Anyone who saw any suspicious activity at the event is asked to call 101 for the attention of PC Stephen Parker.