Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Simple Poll - The easiest way to create polls in Slack
Facebook Local - Discover places to go and events happening near you
Twitter Polls - Polls embedded in tweets
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
doopoll - Create live, instant, editable polls effortlessly