PodKoi - Find podcasts to be interviewed on & guests to interview.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
PodBooker - The easiest way to get booked on podcasts
Facebook Local - Discover places to go and events happening near you
etrigg - See what local events are happening
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets