Question

What was an important day in the life of FDR?

Answer 1

is his inauguration one of them?

Answer 2

I'd also agree that his inauguration is an important day and he led the US through some dramatic moments in its history so that you can pretty much pick and choose what you want to work with. There was his speech to Congress declaring war on Japan to simply getting up in the morning to do what needed to be done while being unable to walk because of polio making every day an important one.

You might find more examples by posting your question in the History thread, though. But I hope that these still help.