Ask HN: How do you keep track of future conferences, call for proposals/papers?

How do you keep track of upcoming conferences, call for proposals or call for papers in your areas of interest?

I have missed some important conferences, paper submission, or talk submissions in the past because I did not know that the conference was happening before the submission deadlines.

I would like to minimize such misses in future. So I want to know how others keep track of such upcoming deadlines.