In an earlier post (2½ years earlier, to be exact) I'd written about my interactive Math bulletin board that actually gets read and used. I've since upgraded and expanded it. It's open year-round now, with a lot more questions and response from my students.
Also, I've started posting these in my Teachers Pay Teachers store at https://www.teacherspayteachers.com/Product/Bulletin-Boards-that-Get-Read-Math-and-History-in-February-March-and-April-4375536
They're grouped into periods of 3 months each. Thus far I have August-September-October, and February-March-April available. In each set you get 50-60 pages of problems for $5.
Here are some newer pictures.