Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
GoPad for Schools - School Management
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Sawyer - Discover a wonder-filled world of kids classes, camps, events, and activities, right in your neighborhood
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.
Yusp - Yusp is a next generation, real-time personalization engine having all product modules as defined by Gartner for various business models.