Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Messenger for Mac - Facebook Messenger wrapped up as a desktop app
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Chatty - Chat with strangers all around the world in Messenger
Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.
Chat for Mac - Facebook Messenger & Chat on your Mac