Here's a  photo from the 1966 May Day Parade in Ada. 

Four of the people in the photo have been identified.  Katherine Smith is the lady with the baby stroller, the two young girls standing by the back of the car are Vicky Conley (Fee) and Connie Hepner (Lehman) and the lady on the motor cycle is Jeanne Hepner.

The store fronts are where Cole Motors has its Main Street lot. (Ada Super Market is same building as Kohl's Market was in picture several weeks ago)

Photo from Tom Lehman