Matsya Purana — Sādhāraṇa Śrāddha: General Ancestral Rite
तृतीयमाभ्युदयिकं वृद्धिश्राद्धं तदुच्यते उत्सवानन्दसम्भारे यज्ञोद्वाहादिमङ्गले //
tṛtīyamābhyudayikaṃ vṛddhiśrāddhaṃ taducyate utsavānandasambhāre yajñodvāhādimaṅgale //
The third is called the ābhyudayika, the śrāddha for prosperity and increase. It is performed on auspicious occasions—at festivals and joyful celebrations, and at rites such as sacrifices (yajña) and weddings.
This verse does not discuss Pralaya; it focuses on ritual dharma—specifically an auspicious form of śrāddha performed for prosperity during joyful events.
It situates śrāddha within gṛhastha duties: a householder (and by extension a king as chief patron of rites) should perform the ābhyudayika/vṛddhi-śrāddha at auspicious milestones like yajñas, weddings, festivals, and celebratory gatherings to invoke welfare and continuity of lineage.
The significance is ritual: it classifies a specific śrāddha (ābhyudayika/vṛddhi) and prescribes its proper occasions—festivals, celebrations, yajñas, and weddings—highlighting timing (maṅgala-kāla) as essential to correct performance.