I thought it might be a cool idea to have a thread devoted to trying to find out who you saw riding a unicycle and might be part of this forum.
I’ll start. Who was riding, i think their 26er, in Tucson AZ around 11:30 right in front of Udal Park?
Thinking this over i doubt it will work but i guess it’s worth a try. 
Coud it be robbo333, Spudman, or Blegas78?
Just a few wild guesses.
The problem is assuming that who you see is one of us, or associated with the people that use this forum. Remember, we are only a tiny percentage of the unicycling population! Though we’re well-connected, there are thousands of unicyclists out there who just ride on their own.