The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Event Hunt - Startups and Tech Events Curated By Locals
Ask Me Help Desk - Ask Me Help Desk is a question-and-answer site.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets