Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Konflist - Curated list of tech conferences all around the world!
pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features
Event Hunt - Startups and Tech Events Curated By Locals
Ticket Tribe - Sell tickets online with no fees per ticket
All Design Conferences - A list of all front-end and design conferences