This isn't professional sports, this is college football, the day they start riding impersonators on motorcycles around the field is the day I stop watching college football (I do realize that you were just throwing examples out, but still there have to be better ones than that). I understand what you are saying, but I don't see it being much of a boost.
Of course you don't.
But think about it for a second.
Imagine if you were a parent with a kid that was invited to participate in some pre-game event, you would proudly be there in the stadium early to watch your little one doing their thing for the whole world to watch on Folsom's big video screens. Fan friendly pre-game activities that include lots of kids are effective because they are cute, and help fill the stands with people on time, people who ordinarily would not be there, including parent's grandparents, and friends.
For example:
Invite a HS drum line to compete against the CU drum line. Could be done in 2 or 3 minutes.
Invite the dance squad like he one Sackman's daughter has joined, to share midfield with CU Express to do a quick dance routine. Similarly invite the best HS cheer squads in the state to perform their competition routine and share the limelight with CU's cheer squad.
Invite CU's fraternity and sororities and challenge them to come up with something meaningful. (community service related or whatever).
Invite Make a Wish foundation participants for a special event. This could be meeting a celebrity like Payton Manning.
Hold a best BBQ contest and a best Custom built CU themed vehicle contest during the first four home games and bring the winners to mid field in November. It would be amazing for the Buffulance and its supporters to have a field pass and drive their pride and joy inside Folsom. Get the Tripple D guy or some cable celebrity to announce the winner of best tailgate food, and some car show host to judge the best custom rig.
Invite the cub scouts, girl scouts, 4H club or whatever to do something cute. Could be running to catch baby livestock, show off model rockets, or a hotdog eating contest.
Have a video tribute to the firefighters who faced the Black Forrest blaze and get these men and women front and center.
A pie in the face event targeting DiStephano, Henderson, Reilly, Klatt...
If any of these events were planned in the moments before the national anthem, there would be more buzz, more reason for people to get in the stadium early, and better community outreach.
None of these stunts take much time, but each would serve to improve reasons for people to put down their beers a little bit earlier and get inside the stadium. Each would add an additional aspect of CU community pride.