If you love bicycling and holiday lights, this is a don't-miss occasion. For the sixth year running, the Bicycle Coalition of Greater Philadelphia organized a group ride through the streets of Philly. Dress in costume or just trick out your bike with lights, sparkles, bells, stars, ornaments and anything else you can think of, and join the show. It's free to participate, but an advance donation will enter you in a raffle to win a slick Gold Fuji Cambridge.