Diwali celebrates the triumph of good over evil
Motorists have been warned that road closures and parking restrictions will be in place for Leicester's Diwali lights switch-on.
Up to 40,000 people are expected to attend the ceremony in Belgrave Road on Sunday.
Belgrave flyover will be closed in both directions from 1100 BST to allow the stage to be set up.
Diversions will be in place and parking will be banned on many streets leading off Belgrave Road.
Temporary one-way systems will also be operating on some roads.
People have also been urged not to bring their own fireworks to the event.
Insp Steve Riley said: "We want to make sure everyone has an enjoyable and safe time at Diwali.
"Not only could they injure themselves [with their own fireworks] or somebody else, but the noise and disturbance they cause can upset local residents."
The city's celebrations of the Hindu festival of light are among the largest outside India.
The word Diwali is an abbreviation of Deepavali, which means cluster of lamps, and the festival celebrates the victory of good over evil.