Sectarian behaviour will not be tolerated by police at this weekend's Orange Walk in Glasgow.
Around 8,000 marchers from the city's 182 lodges are expected to take part in the event which has sparked great controversy in the past.
Strathclyde Police is highlighting the problems caused by people who attach themselves to the parade and may be drinking.
Assistant Chief Constable John Neilson warned: "The main issue for the force and members of the public is the excessive drinking and public nuisance caused by those who follow the parade.
“The force's priority is public safety. We want to make sure people can come in to the city centre without too much disruption or feeling intimidated by excessive drunkenness and sectarian or disorderly behaviour."
The force also promised to clamp down on those caught drinking alcohol in public places. Mr Neilson continued: "Officers will make full use of anti-social behaviour fixed penalty tickets to tackle the consumption of alcohol and urinating in public places."
The march is followed by a rally in Kelvingrove Park where thousands more are expected to attend.
The police appeal has been backed by Orange Order chiefs.
Grand master Ian Wilson said: "The annual Glasgow Boyne Celebrations is the city's biggest street event, and we want spectators to enjoy the music and the pageantry in a carnival atmosphere.
“We do not wish anyone's enjoyment spoiled by the antics of boozed-up foul-mouthed followers. There is no place in our celebration for public drinking, abusive behaviour, or offensive chants."
The event is expected to cause massive traffic disruption in the city centre and West End, with officers on hand to assist motorists with directions.