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Cycle through a winter wonderland next Saturday as part of Somerville’s annual Illuminations Bicycle Tour, which will ride past homes decorated for the season. The hourlong ride will be held Saturday and will meet at 5:50 p.m. in front of the main entrance to Somerville High School at 81 Highland Ave. before departing at 6 p.m. The Somerville Bicycle Committee is holding the ride in conjunction with the Somerville Arts Council’s Illuminations Trolley Tour the same night. Cyclists are encouraged to wear warm clothes and light up their bikes. Costumes are also encouraged, but not required, and the bicycle committee is suggesting $5 donations to the Somerville Arts Council. Hot drinks and treats will be served after the ride at City Hall.