Facebook Local - Discover places to go and events happening near you
PodBooker - The easiest way to get booked on podcasts
TechEvents.co - Tech and startup events aggregator
PodKoi - Find podcasts to be interviewed on & guests to interview.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Speaker Directory by HeySummit - Guests for your next event or podcast (or submit yourself!)