I don't think Florida has been at Penn for a number of years.
Anyways its a good move for those squads. Th LSU meet is 1 day. Penn is a long meet. If your a stud sprinter your running
Prelims 4x1, 4x2, Open 100 or 100/110HH
Finals 4x1, 4x2, Finals 100 or 100/110HH
Maybe a 4x4 or a sprint medley.
Six Warm ups, cool downs and races in 3 days and most often the temperature is not sprint friendly.
Lets be honest that the next two years are important. Rio and London World Champs. A lot of the old guard in the sprints are on the decline. Good chance for the SEC schools to try and get someone into the mix.
You could argue that these schools have always done this style of schedule but maybe they don't want to take a chance with the weather and the heavy schedule.