Police with sniffer dogs carried out an anti-drugs swoop during a Northern Soul night at Padiham Town Hall.
Drug dogs were drafted in to search the Northern Soul and Motown event in Padiham Ballroom last Saturday night.
Officers conducted searches of toilets in the building and spoke to revellers at the popular soul night.
The operation came after a “controlled substance” was reportedly found in a town hall toilet at a previous event.
But police said no illegal substances were found during the pre-planned visit and gave the event a clean bill of health.
The operation was part of a sweep of Padiham town centre pubs and clubs by police. No arrests were made.
PC Graeme Lund, who was part of the operation, said: “We did speak to the organisers and they had prior knowledge. We said we were doing this to ensure that the function continues – not to close it.
“We want it to continue. It is good for the town. But we will not tolerate any substance abuse. It was good that it was all clear.”
Coun. Maureen Whittaker, said: “The Northern Soul night is a very popular and successful event and I am very pleased it got a clean bill of health on Saturday night.”
Police and dog handlers also carried out walk-through of a number of town centre Padiham pubs and Memorial Park which has attracted anti-social behaviour in the past.
Sgt Mick Burnett, of Padiham Police, hailed the operation a success, saying: “It makes people aware that we are keeping a close eye on licencing issues.
“It is a very positive thing that no arrests were made and no drugs were found.
“It is also a deterrent to let people know we will be carrying on making these visits.”