The NYTimes Astronomy Space Calendar
I haven't owned a telescope since high-school, but this calendar from The New York Times is absolutely stellar (pun-intended).
If you're like me, your digital calendar is your best friend. I can't function without one personally. I prefer to use Fantastical for iOS and Mac, from Flexibits. The subscription works all the same in Outlook, Google Calendar, or whatever client you prefer.
For one, I like to know when astronomical events are happening (visible to the naked eye, or not). But what I like the most about this calendar subscription — is it lets me know the who, what, when, where, and why. Replete with a handy link at the bottom of the notes for more information: