Police say they became aware Thursday of an Internet post on a Toronto-based website that referred to the annual "Ford Fest" event to be held the following day at an east-end park.
It's alleged the author of the post offered free beer to anyone who threw eggs or tomatoes at Ford.
Police say Dilaz Rajwani, 37, turned himself in on Friday afternoon, and is charged with counselling an uncommitted indictable offence.
He is scheduled to appear in court on Sept. 3.
Hundreds of supporters and a handful of protesters showed up for Friday evening's party, where the mayor shook hands, posed for pictures and signed autographs.
Ford's role as mayor has been largely symbolic since November, when city council stripped him of most of his power following his admissions of alcohol abuse and drug use during "drunken stupors.''
He spent nearly two months in rehab earlier this year to tackle substance abuse problems.
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