International Volunteer Day (IVDay) is an international event run by UN Volunteers and celebrated every year on 5 December. The purpose of IVDay is to recognize and support the spirit of volunteerism to help create a better future. It champions the impact volunteers have in communities, nationally and globally. Volunteering New Zealand have put together some resourcers for the day here: https://www.volunteeringnz.org.nz/resources/ivday/