“Backpack Sunday.” Backpacks collected at Portland churches will be given to patrons at St. Vincent de Paul Soup Kitchen. St. Pius Church, 492 Ocean Ave., Portland. 4-6 p.m. Saturday, 6 a.m.-6 p.m. Sunday.

“Snowfall,” the Maine Gay Men’s Chorus winter concert. $15 advance, $20 at door. First Parish Unitarian Universalist Church, 425 Congress St., Portland. 7:30 p.m. Saturday, 2:30 p.m. Sunday.

Buddhism Unwrapped. Class will introduce the path to Buddhahood. After lectures, there will be a short meditation and then open discussion. $10 suggested donation. Merrymeeting Arts Center, 9 Main St., Bowdoinham. 10 a.m. Sunday.

Freedom from Attachment, drop-in meditation classes. $10, $5 students and seniors. The Yoga Center, 449 Forest Ave., Portland. 10-11:30 a.m. Sunday.

Spanish Mass. Day of prayer services, focusing on plight of migrants and refugees. Sacred Heart/St. Dominic’s Church, 80 Sherman St., Portland. 12:30 p.m. Sunday.

Bishop Deeley to celebrate 125th anniversary Mass of St. Francis of Assisi Church at 81 Court St., Belfast. 1 p.m. Sunday.

Advent Vespers. The Meetinghouse Choir presents a candlelight service featuring an Advent Litany by Maria Kane. Free. First Congregational Church UCC, 301 Cottage Road, South Portland. 5:30 p.m. Sunday.

Prayer, Promises, Hope and Faith. The Rev. Jeff Monroe, St. Augustine Anglican Church, continues Bible study series at 5:30 p.m. Wednesdays at 656 Route 1, Scarborough.

Living Nativity. Outdoor event with live animals. Carols, cocoa and other refreshments will follow. Free. Standish Congregational Church, 25 Oak Hill Road. 7-8:30 p.m. Wednesday.

“Theology on Tap,” a gathering of college students and young adults (ages 18-39) that features food, drinks, conversation and engaging discussions. Free. Sea Dog Brewing Company, 1 Bowdoin Mill Island, Topsham. 9 p.m. Friday.

To submit an item for the Religion Calendar, go to MaineToday.com and click on the calendar tab.