The is a significant ritual in the BAPS Swaminarayan Sanstha, performed to seek peace, harmony, and the fulfillment of spiritual or personal endeavors. For those looking for the Mahapuja Vidhi (the procedure and chants), several official and community resources provide detailed PDF guides. Official BAPS Mahapuja Resources
For a detailed explanation (not the raw Sanskrit text), you can refer to: “Hindu Rituals and Routines – Why do we follow?” (BAPS publication) or the Vachanamrut with Swamini Vato —which contain the philosophical basis of Mahapuja.