Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Speaker Directory by HeySummit - Guests for your next event or podcast (or submit yourself!)
Event Hunt - Startups and Tech Events Curated By Locals
PodKoi - Find podcasts to be interviewed on & guests to interview.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
PitchPodcasts - Promote your podcast to 325+ podcasts and 1.5K users