A Sale resident recently wrote a letter to Wellington Shire Council expressing his concerns about a rowdy party at the Stephenson Park function rooms last Saturday.

It is understood more than 300 people attended the event and the nearby Sale City Junior Football Club and Sale City Auskick Centre suffered some vandalism on the same night.

The resident said he was concerned by the behaviour, in particular issues of under-age drinking and "irresponsible youth''.

"With the upcoming Triple J concert at the Sale main oval later this month, it may serve as a warning for the residents of Sale to take necessary precautions to preserve public and personal and assets,'' he said.

Wellington Police Service Area Inspector Michael McGinn said although the One Night Stand concert was being promoted as a drug and alcohol free event, police were taking as many precautions as they could.

He said residents of homes near the concert needed to be aware what was going on, but shouldn't have too much to worry about.

"We've got some great bands coming down and we're hoping that people will enjoy themselves but behave appropriately,'' he said.

"The best outcome is a nice, well behaved crowd and I think most people want that.

"But in the event of anything happening we'll be well prepared for it.''

Police are bringing in extra "booze buses'' for the event, as well as drug sniffer dogs and horse patrols, among other initiatives.

"We're anticipating somewhere in the vicinity of 20,000 people coming and we're going to make sure we're around and very visible,'' Inspector McGinn said.

"We've got significant resources coming from across the region and from the metro area to give us a hand.

"It'll be a busy night and if people call us, we ask them to keep in mind it might take us a little longer to get there.''

A Wellington Shire Council spokesman said all precautions were being taken to make sure the One Night Stand event remained alcohol and drug free.

People will be searched at the gate and will have any food and drink confiscated.

Free water will be available at the event and there will also be food for sale.

The spokesman said there would also be breath tests and people would be refused entry if they were intoxicated.

Security measures will also be in place so people can't "flick things in'' over the fence.

"It is a drug and alcohol free event and we're taking that very seriously,'' the spokesman said.