@futurebird If you're a fan of this sort of thing, I recommend the book "If at All Possible, Involve a Cow" or the MIT hacks page: http://hacks.mit.edu/Hacks/
Seems apocryphal, from all that I can find out (MIT alum here).
Also, Harvard stadium security is more present nowadays.
However, a small aerial drone dragging a black & white striped cloth, playing a whistle, shooting breadcrumbs at the same time each day... that should be do-able.
I mean, yeah, they have security. But do they have air defenses?