The MariaDB Developer Unconference is taking place in New York 23-24 Feb, just before OpenWorks: https://mariadb.org/2019-developers-unconference-new-york/

Please sign up on the Meetup page: https://www.meetup.com/MariaDB-Developers/events/256385430/ - security is very tight at the building, so everyone needs to be signed up in advance to be given access. There's a cap on the attendance, so don't delay too long.

If you want to suggest a session, the spreadsheet is open for proposals.