Solid - Solid is a solution for online business meetings.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Meetingbird - Powerful meeting scheduling and notes — right in your calendar
TechEvents.co - Tech and startup events aggregator
WhosDown - App where you can genuinely make friends—connecting with someone that shares a common interest
Facebook Local - Discover places to go and events happening near you