You need an after party ticket, not RubyKaigi 2017's one. Ruby-core committers and RubyKaigi 2017 speakers can attend the party without a ticket. This is the ticketing site for RubyKaigi 2017 Official Conference Party On the first night of RubyKaigi, there will be a party with food and drinks at the conference venue. Come join the party, enjoy local food, sake, and conversation with Rubyists from