Siteoly - The fastest way to build websites using Google Sheets
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Spreadsheet 2 Site - Generate beautiful list sites from your spreadsheets
Facebook Local - Discover places to go and events happening near you
XCalSync - Automatically copy events between your calendars.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets