If Colorado Day fell during the normal school year, there might be more of an observance.
The photo is of the state flower, Aquilegia caerulea, the Colorado blue columbine, growing at a relatively low elevation in the Wet Mountains, but on a damp, north-facing slope.
UPDATE: In its weekly "Peaks of the Past" retrospective, the Wet Mountain Tribune has this:
Colorado Day witnessed no great demonstration here. Some bunting was in evidence but business was conducted about the same as on any other day.