Sadly, I can't join you but I hope you all have a great ride and enjoy the music!
Going off on a tangent, several years ago I ran a series of bicycle treasure hunts around the City for the LCC. Usual stuff - cryptic clues, lots of looking up and looking down and a token prize for the person/team with the most correct answers when they get to the pub. The first one was won by a couple of guys on unicycles - they had the advantage of being able to backtrack easily if they missed something! If that sounds interesting, let me know and I'll put one together for the early autumn.