Thousands of devotees from various parts of the country witnessed the holy event.
Bishop of Thanjavurr M Devadass Ambrose presided over the flag hoisting ceremony.
After special prayers, the 22-ft long and 14-ft broad holy flag was taken in procession around the church through Vailankanni bazaar, Ariyanattu Street and Beach road and was hoisted later.
Following the flag hoisting ceremony, holy mass, litany and benediction were conducted.
During the festival days (Aug 29-Sep 8), holy mass will be conducted at the main shrine.
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District Collector C Suresh Kumar said tight security arrangements have been made under the direct supervision of Nagapattinam SP Deshmukh Shekar Sanjay.
The Tamil Nadu State Transport Corporation is operating special buses from Chennai, Madurai, Karur, Tiruchirappalli, Thanjavur, Kumbakonam, Mayiladuthurai, Karaikal, Nagapattinam, Chidambaram and Puducherry.
Southern Railway is operating trains from Vasco-da-gama, Thiruvananthapuram, Ernakulam, Chennai, and Tirunelveli while Central Railway has announced special trains from Mumbai.
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