This used to be a fairly regular practice at KGYY up until about a year ago. Once a month for years kids in the Young Eagles program would receive a tour of the tower, and at some point those who were interested could "have a turn at the mic."
The chief differences being that KGYY is -despite the grandiose name "Gary-Chicago International"- a very small field with zero commercial traffic, and that the tower is staffed with "contract controllers" who of course are FAA trained and certified, but are employed by KGYY, not the FAA.
Similarly, groups of Boy Scouts would also receive tours of the tower and be treated to a similar experience. The tower staff were always very receptive to "drop in visitors," often inviting GA pilots to taxi up the access road and park their aircraft in the parking area while visiting!
Sadly, directives from Homeland Security about a year ago forced an end to any of the above, and access to the tower is now permanently restricted from any visitors at all.
For over ten years I was invited to a picnic held at the base of the tower during the annual Gary Airshow, as well as the Chicago Airshow. It was a terrific experience, since it provided the best view of the a/c during ground operations, and a totally unobstructed view of the airshow held on Friday evenings during the "private show" given at the airport. Saturday's and Sunday's public shows are held above either Miller Beach for the Gary Airshow, or the Chicago shoreline in the case of the Chicago Airshow. <!--IBF.ATTACHMENT_1728533-->