Is anyone here riding it?? www.asthmaride.org

on june 4th, i will be riding the 19th annual Asthma Ride to benefit children with asthma. this will be my first century and benefit ever so im pretty excited about participating. i quit smoking last month and this century ride is helping me stay focused and away from cigarettes. (if anyone is interested in pledging their support through sponsership, you can visit my donation page at https://www.kintera.org/faf/donorReg...supId=74102907 . any amount donated would be greatly appreciated.)
over the summer, i had a geared bike built up for me specifically for riding centuries but now im thinking about riding this century fixed. im pretty inexperienced on a geared bike (i pretty much went straight to fixed when i first started riding) and it seems the gears might be unnecessary considering the century is mostly flat. plus i dont want to crash because i forgot about brakes.
For those who have done fixed centuries (specifically the AsthmaRide or Seagull Seacrest), what gearing did you use? i think my current gearing (45x17) is going to be too low for this flat course... was thinking about bumping it up to 45x15. i've heard that there is a pretty strong headwind for most of the course so id like to be able to get some speed and momentum up. should i go higher? i might swap out my bars to something a little more comfortable since im pretty low down on my small frame and nitto 019 pursuit bars. possibly my old profile stoker bars with no drop. Would slapping on some aero bars be going too far??