Your question is one that falls under what I call, "Crystal Ball" questions. No one knows for sure, but as a guess...
This weekend, I suspect, would be very busy. It's a weekend. It's Spring Break for a lot of people. DLR has long hours and the entertainment calendar is busy with lots to see.
That said, add in rain.
Those who have travelled long distances are going to face the weather and go with it because they have limited days to see and do and will just handle it with ponchos, breaks, etc....
Locals are where you will see a decrease in attendance. Many of them won't bother coming to the Park if it's raining (like me!), but others won't care.
HTH,
Dreams