2019-04-17（水）19:00 - 21:10 Announcement ESM, Inc is Night Cruise Sponsor in RubyKaigi 2019. We will serve a Pre-Kaigi Party for RubyKaigi 2019 at Wed, Apr 17. This event is just buffet-style party. Let's enjoy Fukuoka night view with Rubyists from all over the world! Please check the pre…