Been a while since I wrote anything MySQL/MariaDB related here, but there’s the column on the Percona blog, that has weekly updates.
Due to the prevalence of “VIP tickets”, I too signed up for M|18. If you need a discount code, I’ll happily offer them up to you to see if they still work (though I’m sure a quick Google will solve this problem for you). I’ll publish notes, probably in my weekly column.
If you’re in New York and want to say hi, talk shop, etc. don’t hesitate to drop me a line.