If high gas prices have you in a tizzy — more than $50 for a full tank, really? — hit the breaks on your typical CoMo commute this week. As part of the 10th Annual Mayor’s Challenge: Bike, Walk & Wheel Week, Columbia Parks and Recreation, The Health Department and the PedNet Coalition are sponsoring a variety of events to keep Columbians moving sans automobiles. Although the festivities kicked off on Saturday, you can still partake in plenty more activities before the May 21 finale.