The 2021 UN Sunday theme is "All In for Climate Justice: Food Equity and Sustainability"—resources to plan a service are available on our main UN Sunday webpage. The recommended date for a UN Sunday service is the Sunday closest to UN Day on October 24. In 2021, United Nations Day falls on a Sunday! Many congregations choose to have their service on a different day, which is also perfectly fine!
Read instructions (pdf) to create an account on UUA.org and (once logged in) "Share Your Event" to tell about your congregation's UN Sunday service or event.