Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
QR.io - Generate fully customized QR Codes, with color shape & logo
Facebook Local - Discover places to go and events happening near you
VisualCode - QR codes for everything
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
QR Code Payments - Cashless transactions for your business