stop smoking race in Stockholm September. I guess these sort of runs are a good motivation if you are trying to get in shape or live a bit healthier but a part of me also likes running alone without all the hassle of so many people in one place. I am also thinking there might be quite an environmental impact after such an event if it is not done well. At least Blodomloppet in Stockholm was environmentally certified.
P.S. Happy World Environment Day!