The Holy Cross Shrine at Mapranam, located in the Thrissur district of Kerala, is a prominent pilgrimage center known for its annual festival, the Exaltation of the Holy Cross. This festival, celebrated with great enthusiasm and devotion, takes place from September 5th to 21st each year, with the most significant events occurring from September 12th to 15th.

The festival kicks off with the flag hoisting ceremony on September 5th, marking the official start of the celebrations. The period from September 12th to 15th is particularly important, with the highlight being the Thirithelyikkal on September 13th, where devotees light massive candles made of beeswax. These candles, ranging from 1 to 300 kg, are lit by around 500 worshippers as an offering for blessings received from the Holy Cross. This unique custom, which began in 928 A.D., draws about 300,000 worshippers annually.

The most auspicious day of the festival is September 14th, which is celebrated worldwide as the Exaltation of the Holy Cross. On this day, the church hosts the main festal Holy Mass, followed by a grand procession where the statue of St. Sebastian is carried through the town to the beach and back. The procession is accompanied by traditional orchestras, and the entire town is illuminated with vibrant lights, creating a mesmerizing spectacle. The day's events also include the obeisance of holy relics and a spectacular fireworks display.

The festival concludes with the Octave on September 21st, marking the end of the celebrations. Throughout the festival period, various cultural and religious activities take place, including the Pushppakurisu (flower-decked procession) and special prayers. The event also features an obituary service on September 15th to honor deceased parishioners.

The Holy Cross Shrine itself has a rich history and several legends associated with its origin. According to one legend, a cross was unearthed from the Kuhikkattukon locality, and after a miraculous heavy downpour, it was found floating near the present church site. Another legend suggests that local rulers built the church as a token of gratitude for the services of Christians in their territorial disputes. There are also tales of the church being spared during the invasions of Tipu Sultan due to the holiness of the cross.

The church, founded in 928 A.D., is known for its historical significance and miraculous events. Worshippers light candles weighing their own weight or that of their loved ones as a testament to the blessings they have received. This unique tradition, unparalleled anywhere else in the world, attracts visitors from across the globe, including bishops, priests, and laypeople who testify to the shrine's spiritual significance.