Antengo makes events interactive. For free. Literally, there is no cost to add a new tech layer to nearly any event. Need example? Check the homepage of this big fashion/art show with thousands of people:

Ambush Events

Antengo gives the hundres of artists a mobile presence at the live show.

If you're an event producer or community group interested in partnering with Antengo, contact partners@antengo.com