Got this from the "BentTrailRiders" list -- this is in my old stompin' grounds:
 
Calvin's Challenge will be held at the usual place and time: Tecumseh  
High School on Sat, May 3.
In addition to the 12 hr. ultrathon, this year's format will include  
a 6 hr. race (drafting) and a 100 mi. time trial (no drafting).
More information at  
 
 http://www.calvinschallenge.com/
 
Calvin's Challenge has a new owner. Larry Graham of WBC has taken the  
helm.  This is very good news for the recumbent community. Larry is a bent  
pilot.  He races a Carbon Aero for Team Bacchetta, is a twice RAAM qualifier
and multi-state record holder including the E-W trans Ohio record.
We may talk about recumbents being fast but Larry proves it.
 
Hope to see you there,
Denny Oswald

Based on my recovery, I might be in this.  Airwolf has been mentioning it to me for a while.