Percona Live Santa Clara 2018 call for papers ends fairly soon — December 22 2017. It may be extended, but I suggest getting a topic in ASAP so the conference committee can view everything fairly and quickly. Remember this conference is bigger than just MySQL, so please submit topics on MongoDB, other databases like PostgreSQL, time series, etc., and of course MySQL.
What are you waiting for? Submit TODAY!
(It goes without saying that speakers get a free pass to attend the event.)