NOT NECESSARY AND DOES NOT WORK!!!!!!

I just upgraded to El Capitan. I have an old iMac, a new iPhone 6 and an iPad mini. Before I upgraded I used the Mac Calendar. Worked great. After installing El Capitan I had trouble with Calendar - it would not transfer dates, it would not show appointments sent to me by email, etc. I was a wreck so I spent the money on Fantastical2. It is a very complex app and if you need all the colors, bells and whistles it might be great for you. It is difficult to use and, frankly, just plain silly. I just want a really good calendar that transfers between my devices. And go figure - after messing around with my settings and checking into Apple support community groups, I was able to bring Calendar back to life! It does all I need and I am happy again.

Sheldonmine about Fantastical - Calendar, v2.2.3