The Trinamool Congress is all set to hold an annual show of strength today with a mega Martyrs' Day rally in Kolkata where Chief Minister Mamata Banejee is expected to kick off the poll campaign for state elections likely to be held in 2021. The Trinamool Congress chief will address the party supporters in central Kolkata to mark Martyrs' Day, an annual affair to pay tribute to the 13 Congress workers killed in police firing in Mamata Banerjee's rally in 1993. Lakhs of people from across the state participate in the rally every year.