Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
CoSchedule - CoSchedule is the #1 marketing calendar that helps you stay organized and get sh*t done. Plan, produce, publish and promote your content.
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
ChronoFlo Calendar - ChronoFlo Calendar allows you to make beautiful interactive calendars that you can share on the web.
Ticket Tribe - Sell tickets online with no fees per ticket
CalendarX - Get a calendar your audience can follow