The Somerville Bicycle Committee and Somerville Arts Council will hold the third annual Illuminations Tour guided bike ride on Dec. 15, according to an email from tour organizers.
The bike ride coincides with the city's Illumination Tour trolley rides that take spectators around the city to see Somerville's Christmas and holiday lights.
The guided tour will last about 45 minutes or less, and riders will need to wear warm clothes and have bike lights. It meets at 5:50 p.m. at the main entrance to Somerville High School.
Afterward there will be hot drinks and treats at City Hall, the email says.