I feel President's Weekend would be busier than the last weekend of March.
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The items listed at the end of the list for March have a "*" by them.
At the bottom of the post it states - *Starred events have historically began/occurred in that month, but the dates for 2019 have not yet been announced.
You can check out 2018 to see when the events took place this year. Event generally happen about the same time each year.
https://www.disboards.com/threads/2018-calendar-of-events-school-breaks-and-dlr.3635162/
If I had to choose, I'd go with the last weekend of March.
Good luck making a decision.
Geemo