They are very interesting pieces. And September, 1900 was the very first year they held a harvest festival in Pendleton. It was a week-long event that the merchants in town decided to host after having a very successful and profitable 4th of July street fair that same year.
But assigning a value to something like this is very difficult. There isn't really much of a market for this type of memorabilia. You could get some experts to look at it but the value won't be much.