Is it considered inauspicious to start new ventures or make purchases during Pitru Paksha?

Yes, generally, Pitru Paksha is considered an inauspicious period for starting new businesses, buying property or vehicles, housewarming ceremonies (Griha Pravesh), weddings, or other celebratory events. The focus during this time is on remembrance, mourning, and spiritual duties towards ancestors, not worldly celebrations or acquisitions.