Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
PodKoi - Find podcasts to be interviewed on & guests to interview.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
PodBooker - The easiest way to get booked on podcasts
Meetup for iOS and Android - Discover groups that are all about the things you love
Suggest a Guest - Easily suggest a guest for your favorite podcasts