Ethereum Push Notification Service - Protocol for incentivized, blockchain based notifications.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Blockbutler - Real-time transaction notifications for the blockchain
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Notif.me SDK - A Node.js lib to send all your transactional notifications
Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.