How do I find out about free selling days?

I missed the last free selling day because I didn't know it was happening.

I'm signed up for the e-mail notifications but never receive them. In the past I relied on people posting about the days here but that's not always reliable. It seems the only way to know now is to actually start a listing to see the little banner at the bottom but I don't always remember to check.

Is there some other way I'm not thinking of?