The Chicago Pride Parade is Sunday in the Lakeview neighborhood.
Officials are expecting record crowds because this is the first parade since same-sex marriage was legalized in Illinois.
Police are cracking down on side parties along the parade route and they will enforce laws limiting the capacity on balconies and rooftops.
Anyone caught drinking or urinating in public could face a $1,000 fine.
The parade steps off at noon from Montrose and Broadway in Uptown and works its way south to Lincoln Park.