Vap Full Moon Poya, today Sri Lanka Mirror Right to Know. Power to Change Vap Poya Vap full moon poya day is of special significance especially for Buddhists in Sri Lanka because of Katina Cheevara puja the offering of wet season robes to Buddhist priests who RHO Vap Poya This public holiday in Sri Lanka takes place on the full moon day of Vap, the seventh month in the Sinhalese calendar. It usually falls in October in Vap Poya invites us to pause with gratitude and reflect on renewal. It is a time to look inward, strengthen compassion, and embrace unity in life's journey. We hope this sacred day