Hi Yen,

I'm so sorry about the fallen LAPD SWAT officer. I have a first cousin in the LAPD, and have always had respect and gratitude for anyone choosing that path.

My first thought is that it's too late to "get in shape" for Saturday. You'll just end up tiring yourself out and undermining the stamina you'll need for Saturday. I'd just ride as normal, and do the best you can on Saturday. If it's any help, we went from 5 mile rides to 30 mile rides within days of getting our bikes, and just felt a wonderful sort of tired. If we could do 30 miles after only 5 miles, I'll be you can knock off 50 miles after doing lots of 20 mile rides just fine.

Let us know how it goes.