I played HackVent (https://www.hacking-lab.com) in December 2018 and it was a lot of fun. The same site also does HackyEaster which is coming up in a couple of months.

To find CTFs, https://ctftime.org/ is good and has already been mentioned. I've learned about a few on https://www.reddit.com/r/securityCTF/

If you are looking to learn - I highly recommend LiveOverflow's youtube series - https://www.youtube.com/watch?v=iyAyN3GFM7A&list=PLhixgUqwRT...

And a few good places to practice: http://overthewire.org/wargames/ and https://365.csaw.io/