Trying to have a range of dates (and also individual dates) show up on my calendar view

I'm trying to creating an editorial calendar where in sheetview we can have our specific projects and deadline dates, but we also have a column with a few key dates (in a separate column and in red) that are things that come around annually.

The question I have is that some are only days "Christmas" but others are a month long "API History Month" so how do I differentiate on calendar view? Right now they only show up on the first day. I tried to create a date range (a 2nd column with end date) but wasn't sure how to get the calendar to read it. If this isn't possible yet, do you have a workaround?

Thank you!

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