The former Alaska governor and 2008 Republican vice presidential nominee is slated to appear at the GOP event in Rosemont on Wednesday.
Illinois Republicans don't currently hold any statewide offices, and Palin's visit is part of the party's efforts to win in some high-profile races this November.
Palin's visit will be her second to Illinois in about a month.
She spoke to a crowd of about 1,100 people last month at an event in central Illinois.
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