The relics of St Francis Xavier (SFX) were taken into procession from Bom Jesus of Basilica church, where they are housed permanently, to the nearby Se Cathedral church.
The relics would be kept in open for veneration till January 4, 2015.
Churches in the old Goa were awash with pilgrims who began arriving here since last evening.
Elaborate security arrangements have been put in place at the venue, which is closely monitored by more than hundred CCTV cameras.
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After the mass, Sacred Relics were reverently taken in a procession to the Se Cathedral Church.
Upon placing the Relics in the Catherdral, the bishop incensed the Relics and prayed together with the priests gathered following which, devotees were allowed to kiss the relics.
"Pilgrims from across the globe and India, visiting Goa for the St Francis Xavier Exposition 2014, will get an opportunity to participate in the Holy Eucharist at Old Goa in languages of their choice.