This is a long shot, but if anyone is in London (UK) and hasn't already heard, come on down and celebrate the winter solstice at the inaugural Kingston PolyLauf(tm)...
http://www.captainrobbo.org/polylauf/
The centrepiece is a 10,000m relay - teams of any number, split it up any way you like. We also have an 800m baby buggy race with some of Surrey's finest parent-athletes, human-sledge-dragging races, medicine ball throws, superstars-style fitness tests (max squat thrusts in a minute etc), and a massive inter-club snowball fight to finish. Kids and families welcome too - if you can get there, it should be a magic night in the snow!