It is not clear whether she will address more rallies in Karnataka, which goes to polls on May 12.
Party sources said she would address today's rally only.
Mrs Gandhi has not campaigned for almost two years. She was inactive during electioneering in Uttar Pradesh, Gujarat, Punjab, Himachal Pradesh, Uttarakhand, Meghalaya, Tripura, and Nagaland.
In her absence, Rahul Gandhi had steered the party's campaign in the assembly elections.
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