Open season on

In many parts of the world, hunting is restricted to certain times of the year. For example, in the UK, you can hunt pheasant from October through January. When hunting is allowed, it’s “open season.”
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The term can be used metaphorically when a person is open or vulnerable to attack. In the U.S., the opposition Republicans have taken control of part of the legislature. They now have the right to open investigations of President Biden. So you can say, “It’s open season on the Biden presidency as Republicans plan lots of investigations.” That means, the Biden presidency is vulnerable to attack.

In today’s lesson, you learned that a lot of well-known characters from movies will soon enter the public domain. And it will soon be open season on these characters: anyone can make a movie about them. As an example, Winnie-the-Pooh is now a murderer, and next year will feature a Peter Pan horror re-make.