Show HN: Radius – A Meetup.com Alternative

Radius, a Meetup.com alternative, has been relaunched after two years. The platform allows users to find and join events, communities, and groups. New features include 'Activities', which are lightweight events that can be voted on, and are independent of groups. The platform is built with Ruby on Rails. The developer is open to feedback and has plans to potentially open source and federate the platform in the future.