Penn is playing at Harvard today, so maybe that gives Harvard's band somewhat of an excuse for this:
Harvard band spelling 'PENIS'. I don't think that happens by accident. pic.twitter.com/NQZ7ThlTKJ
— Jacob Adler (@jacobadler) November 14, 2015
So, maybe they were in the middle of transitioning from "Penn" to something else, or maybe that's the cover story they planned while setting this up. Of course, maybe they just didn't have enough people to spell things all the way out:
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SB Nation video archives: The best college marching bands (2013)