You're definitely not the only one who would love to have some close-up time with the Blue Turf! It really is a neat experience, having taken grandkids to an Easter egg "hunt" on the Blue recently. I have contacted the University about conducting tours of the field, but, for now, the only alternative is to visit the Allen Noble Hall of Fame near the southwest entrance to the stadium on the Friday before commencement. The Hall of Fame is full of memorabilia and offers great views of the blue turf. The Hall of Famgallery is open during regular work day hours (such as the Friday before Commencement), but visitors should check with the Bronco Athletic Association (208 426-3556 email@example.com) before making any plans.
I'll check with the BAA to see if there is any likelihood that the Allen Noble Hall of Fame would be closed for any reason on the Friday before Commencement and will let you know.