Personally, I maintain a living spreadsheet for NYC concerts, which I update at least twice a week with newly announced shows, while archiving which ones I've attended. I include date and price information and show notes, and before you ask, it's color-coded.

I'm definitely more of a "planner" than most of my peers, so I basically keep it to myself, but I share weekly snippets over on r/NYCConcerts. That is to say, anyone interested in seeing a rock concert this month can subscribe there for more info.